diff --git a/README.md b/README.md
index 2cc1352..550dffc 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,18 @@ To embed the handler in your own server, import [`gobl.dev/api`](./api)
 (`api.NewHandler(...)`) and blank-import [`gobl.dev/bundle`](./bundle) to register
 the addons.
 
+### Editor-private routes
+
+The browser editor uses a few additional routes that are not part of the GOBL
+API surface:
+
+| Method | Path | Description |
+|--------|------|-------------|
+| `GET` | `/_editor/examples` | List curated starter invoices (ID, label, country, addon) |
+| `GET` | `/_editor/examples/{id}` | Raw JSON of a curated example |
+| `GET` | `/_editor/formats` | List output formats the viewer can render |
+| `POST` | `/_editor/convert?format={id}` | Convert a GOBL envelope to the requested output (UBL, CII, FatturaPA, HTML) |
+
 ## WebAssembly
 
 [`wasm/`](./wasm) compiles GOBL to WebAssembly so it can run in the browser, and
diff --git a/editor/assets/editor-data.js b/editor/assets/editor-data.js
index a46b01d..003b99e 100644
--- a/editor/assets/editor-data.js
+++ b/editor/assets/editor-data.js
@@ -2,6 +2,8 @@
 // Loaded as a synchronous script (before Alpine.js which is deferred)
 // so the alpine:init listener is registered in time.
 document.addEventListener("alpine:init", () => {
+  const bootstrap = readBootstrap();
+
   Alpine.data("editor", () => ({
     loading: false,
     envelop: false,
@@ -9,6 +11,18 @@ document.addEventListener("alpine:init", () => {
     // Counter so each successful build creates a fresh FlashMessage.
     success: 0,
 
+    // Example picker state.
+    examples: bootstrap.examples || [],
+    exampleID: bootstrap.initialExampleID || "",
+
+    // Viewer state.
+    formats: bootstrap.formats || [],
+    format: localStorage.getItem("editor-format") || "",
+    viewerMode: "", // "xml" | "html" | ""
+    viewerHTML: "",
+    viewerLoading: false,
+    _lastEnvelope: null,
+
     init() {
       window.addEventListener("keydown", (e) => {
         if ((e.metaKey || e.ctrlKey) && e.key === "Enter") {
@@ -16,6 +30,54 @@ document.addEventListener("alpine:init", () => {
           this.build();
         }
       });
+      this.$watch("format", (v) => {
+        localStorage.setItem("editor-format", v || "");
+        if (!v) {
+          this.viewerMode = "";
+          this.viewerHTML = "";
+          return;
+        }
+        this.updateViewerMode();
+      });
+      if (this.exampleID) {
+        // editor.js is loaded as a module and may still be initialising when
+        // alpine:init fires — wait for CodeMirror to be ready before loading.
+        (window._cmReady || Promise.resolve()).then(() =>
+          this.loadExample(this.exampleID),
+        );
+      }
+    },
+
+    updateViewerMode() {
+      const f = this.formats.find((x) => x.id === this.format);
+      this.viewerMode = f && f.mime.startsWith("text/html") ? "html" : "xml";
+    },
+
+    async loadExample(id) {
+      if (!id) return;
+      try {
+        await (window._cmReady || Promise.resolve());
+        const res = await fetch("/_editor/examples/" + encodeURIComponent(id));
+        if (!res.ok) throw new Error("failed to load example: " + res.status);
+        const text = await res.text();
+        window._cmSetEditorDoc(text);
+        this.exampleID = id;
+        this._lastEnvelope = null;
+        this.viewerHTML = "";
+        if (window._cmSetViewerXML) window._cmSetViewerXML("");
+      } catch (e) {
+        this.error = { message: e.message };
+      }
+    },
+
+    onFormatChange() {
+      if (!this.format) return;
+      this.updateViewerMode();
+      if (this._lastEnvelope) {
+        this.convert(this._lastEnvelope);
+      } else {
+        this.build();
+      }
     },
 
     async build() {
@@ -58,12 +120,53 @@ document.addEventListener("alpine:init", () => {
         });
         ed.focus();
         this.success++;
+        this._lastEnvelope = result;
+
+        if (this.format) {
+          await this.convert(result);
+        }
       } catch (e) {
         this.error = { message: e.message };
       } finally {
         this.loading = false;
       }
     },
+
+    async convert(envelope) {
+      if (!this.format) return;
+      this.viewerLoading = true;
+      try {
+        const res = await fetch(
+          "/_editor/convert?format=" + encodeURIComponent(this.format),
+          {
+            method: "POST",
+            headers: { "Content-Type": "application/json" },
+            body: JSON.stringify(envelope),
+          },
+        );
+
+        if (!res.ok) {
+          const err = await res.json().catch(() => ({
+            message: "conversion failed: " + res.status,
+          }));
+          this.error = err;
+          this.viewerHTML = "";
+          if (window._cmSetViewerXML) window._cmSetViewerXML("");
+          return;
+        }
+
+        const text = await res.text();
+        if (this.viewerMode === "html") {
+          this.viewerHTML = text;
+        } else {
+          if (window._cmSetViewerXML) window._cmSetViewerXML(text);
+        }
+      } catch (e) {
+        this.error = { message: e.message };
+      } finally {
+        this.viewerLoading = false;
+      }
+    },
   }));
 
   Alpine.data("darkModeToggle", () => ({
@@ -90,3 +193,14 @@ document.addEventListener("alpine:init", () => {
     },
   }));
 });
+
+function readBootstrap() {
+  const el = document.getElementById("editor-bootstrap");
+  if (!el) return {};
+  try {
+    return JSON.parse(el.textContent);
+  } catch (e) {
+    console.warn("Failed to parse editor bootstrap:", e);
+    return {};
+  }
+}
diff --git a/editor/assets/editor.css b/editor/assets/editor.css
index 9d1f220..ce033a7 100644
--- a/editor/assets/editor.css
+++ b/editor/assets/editor.css
@@ -1,8 +1,15 @@
-/* CodeMirror container sizing */
+/* Split container */
 #editor-container {
   flex: 1;
   overflow: hidden;
 }
+#editor-pane,
+#viewer-pane {
+  overflow: hidden;
+}
+#viewer-xml {
+  height: 100%;
+}
 .cm-editor {
   height: 100%;
 }
diff --git a/editor/assets/editor.js b/editor/assets/editor.js
index da062bf..5ec6cce 100644
--- a/editor/assets/editor.js
+++ b/editor/assets/editor.js
@@ -1,53 +1,23 @@
 // editor.js -- ES module for GOBL Editor
-// Initializes CodeMirror with JSON schema support.
+// Initializes the main editing CodeMirror and a read-only XML viewer.
+// window._cmReady + window._cmReadyResolve are created by an inline script
+// in <head>; this module resolves the promise once CodeMirror is mounted.
 
 import { basicSetup, EditorView } from "codemirror";
 import { EditorState, Compartment } from "@codemirror/state";
 import { vsCodeLight } from "@fsegurai/codemirror-theme-vscode-light";
 import { vsCodeDark } from "@fsegurai/codemirror-theme-vscode-dark";
 
-// Theme compartment allows dynamic reconfiguration.
-const themeCompartment = new Compartment();
+// Compartments allow dynamic reconfiguration.
+const editorThemeCompartment = new Compartment();
+const viewerThemeCompartment = new Compartment();
 
 function isDark() {
   return document.documentElement.classList.contains("dark");
 }
 
-const defaultDoc = JSON.stringify(
-  {
-    $schema: "https://gobl.org/draft-0/bill/invoice",
-    currency: "USD",
-    issue_date: new Date().toISOString().slice(0, 10),
-    supplier: {
-      name: "Acme Inc.",
-      tax_id: {
-        country: "US",
-      },
-    },
-    customer: {
-      name: "Sample Customer",
-    },
-    lines: [
-      {
-        quantity: "10",
-        item: {
-          name: "Development Services",
-          price: "100.00",
-        },
-        taxes: [
-          {
-            cat: "ST",
-            percent: "8.25%",
-          },
-        ],
-      },
-    ],
-  },
-  null,
-  2,
-);
-
 const { jsonSchema, updateSchema } = await import("codemirror-json-schema");
+const { xml: xmlLang } = await import("@codemirror/lang-xml");
 
 const SCHEMA_PREFIX = "https://gobl.org/draft-0/";
 let activeSchemaURL = null;
@@ -70,15 +40,16 @@ async function loadSchemaFromDoc(view) {
   }
 }
 
-const container = document.getElementById("editor-container");
-container.replaceChildren();
+// Mount the main editor inside #editor-pane.
+const editorMount = document.getElementById("editor-pane");
+editorMount.replaceChildren();
 
 const editor = new EditorView({
   state: EditorState.create({
-    doc: defaultDoc,
+    doc: "",
     extensions: [
       basicSetup,
-      themeCompartment.of(isDark() ? vsCodeDark : vsCodeLight),
+      editorThemeCompartment.of(isDark() ? vsCodeDark : vsCodeLight),
       EditorView.lineWrapping,
       jsonSchema(),
       EditorView.updateListener.of((update) => {
@@ -92,14 +63,60 @@ const editor = new EditorView({
       }),
     ],
   }),
-  parent: container,
+  parent: editorMount,
 });
 
 window._cmEditor = editor;
+
+// Lazily-created read-only viewer for XML output.
+let viewerView = null;
+
+function ensureViewer() {
+  if (viewerView) return viewerView;
+  const parent = document.getElementById("viewer-xml");
+  if (!parent) return null;
+  viewerView = new EditorView({
+    state: EditorState.create({
+      doc: "",
+      extensions: [
+        basicSetup,
+        viewerThemeCompartment.of(isDark() ? vsCodeDark : vsCodeLight),
+        EditorView.lineWrapping,
+        EditorView.editable.of(false),
+        EditorState.readOnly.of(true),
+        xmlLang(),
+      ],
+    }),
+    parent,
+  });
+  return viewerView;
+}
+
+window._cmSetViewerXML = (text) => {
+  const v = ensureViewer();
+  if (!v) return;
+  v.dispatch({
+    changes: { from: 0, to: v.state.doc.length, insert: text },
+  });
+};
+
 window._cmSetDark = (dark) => {
+  const theme = dark ? vsCodeDark : vsCodeLight;
+  editor.dispatch({
+    effects: editorThemeCompartment.reconfigure(theme),
+  });
+  if (viewerView) {
+    viewerView.dispatch({
+      effects: viewerThemeCompartment.reconfigure(theme),
+    });
+  }
+};
+
+window._cmSetEditorDoc = (text) => {
   editor.dispatch({
-    effects: themeCompartment.reconfigure(dark ? vsCodeDark : vsCodeLight),
+    changes: { from: 0, to: editor.state.doc.length, insert: text },
   });
+  loadSchemaFromDoc(editor);
 };
-loadSchemaFromDoc(editor);
 
+if (window._cmReadyResolve) window._cmReadyResolve();
diff --git a/editor/convert.go b/editor/convert.go
new file mode 100644
index 0000000..aafd0fc
--- /dev/null
+++ b/editor/convert.go
@@ -0,0 +1,302 @@
+package editor
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/invopop/gobl"
+	"github.com/invopop/gobl/bill"
+	"github.com/invopop/gobl/cbc"
+
+	goblapi "github.com/invopop/gobl.dev/api"
+	cii "github.com/invopop/gobl.cii"
+	goblhtml "github.com/invopop/gobl.html"
+	ubl "github.com/invopop/gobl.ubl"
+)
+
+// Format describes an output format offered by the viewer pane.
+type Format struct {
+	ID    string `json:"id"`
+	Label string `json:"label"`
+	Group string `json:"group"`
+	MIME  string `json:"mime"`
+
+	convert func(ctx context.Context, env *gobl.Envelope) ([]byte, error)
+}
+
+var formats = []Format{
+	{
+		ID:      "ubl",
+		Label:   "UBL — EN 16931",
+		Group:   "UBL",
+		MIME:    "application/xml",
+		convert: convertUBL(ubl.ContextEN16931),
+	},
+	{
+		ID:      "ubl-peppol",
+		Label:   "UBL — Peppol BIS 3.0",
+		Group:   "UBL",
+		MIME:    "application/xml",
+		convert: convertUBL(ubl.ContextPeppol),
+	},
+	{
+		ID:      "ubl-xrechnung",
+		Label:   "UBL — XRechnung",
+		Group:   "UBL",
+		MIME:    "application/xml",
+		convert: convertUBL(ubl.ContextXRechnung),
+	},
+	{
+		ID:      "ubl-peppol-fr-cius",
+		Label:   "UBL — Peppol France CIUS",
+		Group:   "UBL",
+		MIME:    "application/xml",
+		convert: convertUBL(ubl.ContextPeppolFranceCIUS),
+	},
+	{
+		ID:      "ubl-peppol-fr-ext",
+		Label:   "UBL — Peppol France Extended",
+		Group:   "UBL",
+		MIME:    "application/xml",
+		convert: convertUBL(ubl.ContextPeppolFranceExtended),
+	},
+	{
+		ID:    "cii",
+		Label: "CII — EN 16931",
+		Group: "CII",
+		MIME:  "application/xml",
+		convert: convertCII(cii.ContextEN16931V2017),
+	},
+	{
+		ID:      "cii-peppol",
+		Label:   "CII — Peppol BIS 3.0",
+		Group:   "CII",
+		MIME:    "application/xml",
+		convert: convertCII(cii.ContextPeppolV3),
+	},
+	{
+		ID:      "cii-facturx",
+		Label:   "CII — Factur-X",
+		Group:   "CII",
+		MIME:    "application/xml",
+		convert: convertCII(cii.ContextFacturXV1),
+	},
+	{
+		ID:      "cii-zugferd",
+		Label:   "CII — ZUGFeRD",
+		Group:   "CII",
+		MIME:    "application/xml",
+		convert: convertCII(cii.ContextZUGFeRDV2),
+	},
+	{
+		ID:      "cii-xrechnung",
+		Label:   "CII — XRechnung",
+		Group:   "CII",
+		MIME:    "application/xml",
+		convert: convertCII(cii.ContextXRechnungV3),
+	},
+	// TODO: re-enable FatturaPA once gobl.fatturapa is released against
+	// xmldsig v0.14.0 (WithXAdESConfig). v0.69.0 still calls the removed
+	// xmldsig.WithXAdES and conflicts with gobl.ubl's xmldsig v0.14.0.
+	// {
+	// 	ID:    "fatturapa",
+	// 	Label: "FatturaPA",
+	// 	Group: "Italy",
+	// 	MIME:  "application/xml",
+	// 	convert: func(_ context.Context, env *gobl.Envelope) ([]byte, error) {
+	// 		doc, err := fatturapa.Convert(env)
+	// 		if err != nil {
+	// 			return nil, err
+	// 		}
+	// 		return doc.Bytes()
+	// 	},
+	// },
+	{
+		ID:    "html",
+		Label: "HTML preview",
+		Group: "Preview",
+		MIME:  "text/html; charset=utf-8",
+		convert: func(ctx context.Context, env *gobl.Envelope) ([]byte, error) {
+			return goblhtml.Render(ctx, env)
+		},
+	},
+}
+
+// convertUBL builds a UBL converter closure bound to a specific context.
+// gobl.ubl.Convert handles addon injection internally via ensureAddons.
+func convertUBL(cx ubl.Context) func(context.Context, *gobl.Envelope) ([]byte, error) {
+	return func(_ context.Context, env *gobl.Envelope) ([]byte, error) {
+		doc, err := ubl.Convert(env, ubl.WithContext(cx))
+		if err != nil {
+			return nil, err
+		}
+		return ubl.Bytes(doc)
+	}
+}
+
+// convertCII builds a CII converter closure that auto-injects any missing
+// addons the chosen context requires, recalculates totals, and then serialises
+// to XML bytes.
+func convertCII(cx cii.Context) func(context.Context, *gobl.Envelope) ([]byte, error) {
+	return func(_ context.Context, env *gobl.Envelope) ([]byte, error) {
+		if err := ensureInvoiceAddons(env, cx.Addons); err != nil {
+			return nil, err
+		}
+		raw, err := cii.Convert(env, cii.WithContext(cx))
+		if err != nil {
+			return nil, err
+		}
+		doc, ok := raw.(*cii.Invoice)
+		if !ok {
+			return nil, fmt.Errorf("cii: unexpected document type %T", raw)
+		}
+		return doc.Bytes()
+	}
+}
+
+// ensureInvoiceAddons appends any missing required addons to the envelope's
+// bill.Invoice and recalculates so that scenario-driven extensions are
+// populated before conversion.
+func ensureInvoiceAddons(env *gobl.Envelope, required []cbc.Key) error {
+	if len(required) == 0 {
+		return nil
+	}
+	inv, ok := env.Extract().(*bill.Invoice)
+	if !ok {
+		return nil
+	}
+	existing := inv.GetAddons()
+	missing := make([]cbc.Key, 0, len(required))
+	for _, a := range required {
+		if !a.In(existing...) {
+			missing = append(missing, a)
+		}
+	}
+	if len(missing) == 0 {
+		return nil
+	}
+	inv.SetAddons(append(existing, missing...)...)
+	if err := inv.Calculate(); err != nil {
+		return fmt.Errorf("calculate with addons %v: %w", missing, err)
+	}
+	return nil
+}
+
+// FormatInfo is the public subset of a Format, suitable for rendering or
+// serialising to the browser.
+type FormatInfo struct {
+	ID    string `json:"id"`
+	Label string `json:"label"`
+	Group string `json:"group"`
+	MIME  string `json:"mime"`
+}
+
+// formatList returns the public format metadata in registration order.
+func formatList() []FormatInfo {
+	out := make([]FormatInfo, 0, len(formats))
+	for _, f := range formats {
+		out = append(out, FormatInfo{f.ID, f.Label, f.Group, f.MIME})
+	}
+	return out
+}
+
+// findFormat looks up a format by ID.
+func findFormat(id string) (Format, bool) {
+	for _, f := range formats {
+		if f.ID == id {
+			return f, true
+		}
+	}
+	return Format{}, false
+}
+
+// handleFormats returns the list of available output formats.
+func handleFormats(w http.ResponseWriter, _ *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	_ = json.NewEncoder(w).Encode(formatList())
+}
+
+// handleConvert accepts a GOBL envelope in the body and returns the converted
+// output for the requested format. Errors are returned as a JSON payload in
+// the same shape as the core /v0/build endpoint — including structured
+// rules.Fault entries when the converter fails validation — so the editor's
+// error panel can render them identically.
+func handleConvert(w http.ResponseWriter, r *http.Request) {
+	id := r.URL.Query().Get("format")
+	f, ok := findFormat(id)
+	if !ok {
+		goblapi.WriteError(w, gobl.ErrInput.WithReason("unknown format: %s", id))
+		return
+	}
+
+	body, err := io.ReadAll(http.MaxBytesReader(w, r.Body, 2<<20))
+	if err != nil {
+		goblapi.WriteError(w, gobl.ErrInput.WithCause(fmt.Errorf("read body: %w", err)))
+		return
+	}
+
+	env, err := parseConvertBody(body)
+	if err != nil {
+		goblapi.WriteError(w, asGoblError(err))
+		return
+	}
+
+	out, err := safeConvert(r.Context(), f, env)
+	if err != nil {
+		goblapi.WriteError(w, asGoblError(err))
+		return
+	}
+
+	w.Header().Set("Content-Type", f.MIME)
+	_, _ = w.Write(out)
+}
+
+// parseConvertBody accepts either a full GOBL envelope or a bare document
+// (e.g. a bill.Invoice) — the editor sends the latter when "Envelop" is
+// unchecked — and returns a calculated envelope ready for conversion.
+func parseConvertBody(body []byte) (*gobl.Envelope, error) {
+	// Try the envelope shape first — it's the output of a built /v0/build
+	// with envelop=true.
+	env := new(gobl.Envelope)
+	if err := json.Unmarshal(body, env); err == nil && env.Document != nil && env.Extract() != nil {
+		return env, nil
+	}
+	// Otherwise parse via the schema registry and wrap.
+	doc, err := gobl.Parse(body)
+	if err != nil {
+		return nil, gobl.ErrInput.WithCause(fmt.Errorf("parse document: %w", err))
+	}
+	wrapped, err := gobl.Envelop(doc)
+	if err != nil {
+		return nil, err
+	}
+	return wrapped, nil
+}
+
+// asGoblError normalises a converter error into a *gobl.Error so it serialises
+// with the {key, faults, message} shape that the editor's error panel expects.
+// Errors that already are *gobl.Error pass through untouched, preserving their
+// rules.Faults cause for path-level rendering.
+func asGoblError(err error) *gobl.Error {
+	var ge *gobl.Error
+	if errors.As(err, &ge) {
+		return ge
+	}
+	return gobl.ErrInternal.WithCause(err)
+}
+
+// safeConvert wraps the converter call with panic recovery so upstream bugs
+// (e.g. missing regime branches in gobl.html) surface as 4xx errors instead of
+// crashing the server.
+func safeConvert(ctx context.Context, f Format, env *gobl.Envelope) (out []byte, err error) {
+	defer func() {
+		if rec := recover(); rec != nil {
+			err = fmt.Errorf("converter panicked: %v", rec)
+		}
+	}()
+	return f.convert(ctx, env)
+}
diff --git a/editor/convert_test.go b/editor/convert_test.go
new file mode 100644
index 0000000..30f0a25
--- /dev/null
+++ b/editor/convert_test.go
@@ -0,0 +1,164 @@
+package editor
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/invopop/gobl.dev/editor/examples"
+	"github.com/invopop/gobl"
+)
+
+// buildEnvelope runs the curated example through the GOBL build flow to
+// produce a calculated envelope ready for conversion.
+func buildEnvelope(t *testing.T, exampleID string) *gobl.Envelope {
+	t.Helper()
+	data, ok := examples.Get(exampleID)
+	if !ok {
+		t.Fatalf("example %q not found", exampleID)
+	}
+	doc, err := gobl.Parse(data)
+	if err != nil {
+		t.Fatalf("parse example %s: %v", exampleID, err)
+	}
+	env, err := gobl.Envelop(doc)
+	if err != nil {
+		t.Fatalf("envelop %s: %v", exampleID, err)
+	}
+	if err := env.Calculate(); err != nil {
+		t.Fatalf("calculate envelope for %s: %v", exampleID, err)
+	}
+	return env
+}
+
+func TestFormatConversions(t *testing.T) {
+	cases := []struct {
+		format    string
+		example   string
+		wantStart string
+	}{
+		{"ubl", "de-xrechnung", "<?xml"},
+		{"ubl-peppol", "de-xrechnung", "<?xml"},
+		{"ubl-xrechnung", "de-xrechnung", "<?xml"},
+		{"cii", "de-xrechnung", "<?xml"},
+		{"cii-facturx", "fr-facturx", "<?xml"},
+		{"cii-xrechnung", "de-xrechnung", "<?xml"},
+		// TODO: re-enable once FatturaPA is re-enabled in convert.go.
+		// {"fatturapa", "it-fatturapa", "<?xml"},
+		{"html", "us", "<html"},
+	}
+	for _, c := range cases {
+		t.Run(c.format+"/"+c.example, func(t *testing.T) {
+			f, ok := findFormat(c.format)
+			if !ok {
+				t.Fatalf("format %q not registered", c.format)
+			}
+			env := buildEnvelope(t, c.example)
+			out, err := f.convert(context.Background(), env)
+			if err != nil {
+				t.Fatalf("convert: %v", err)
+			}
+			if len(out) == 0 {
+				t.Fatalf("empty output")
+			}
+			if !strings.HasPrefix(strings.ToLower(strings.TrimSpace(string(out))), c.wantStart) {
+				t.Fatalf("unexpected prefix; got %q", head(out, 80))
+			}
+		})
+	}
+}
+
+func TestHandleConvertSurfacesValidationFaults(t *testing.T) {
+	// us.json is a minimal US sales-tax invoice — it doesn't satisfy EN16931,
+	// so asking for UBL forces gobl.ubl to auto-inject en16931 and fail
+	// validation. The resulting *gobl.Error must round-trip through the HTTP
+	// layer as {key, message, faults:[{code, paths, message}]} so the editor
+	// can highlight the offending paths exactly like it does for /v0/build.
+	env := buildEnvelope(t, "us")
+	raw, err := json.Marshal(env)
+	if err != nil {
+		t.Fatalf("marshal envelope: %v", err)
+	}
+	r := httptest.NewRequest(http.MethodPost, "/_editor/convert?format=ubl", bytes.NewReader(raw))
+	w := httptest.NewRecorder()
+	handleConvert(w, r)
+
+	if w.Code != http.StatusUnprocessableEntity {
+		t.Fatalf("status: got %d, want 422", w.Code)
+	}
+	var body struct {
+		Key     string `json:"key"`
+		Message string `json:"message"`
+		Faults  []struct {
+			Code    string   `json:"code"`
+			Paths   []string `json:"paths"`
+			Message string   `json:"message"`
+		} `json:"faults"`
+	}
+	if err := json.NewDecoder(w.Body).Decode(&body); err != nil {
+		t.Fatalf("decode body: %v", err)
+	}
+	if body.Key == "" {
+		t.Fatalf("missing gobl error key; body: %+v", body)
+	}
+	if len(body.Faults) == 0 {
+		t.Fatalf("expected faults list; got message=%q", body.Message)
+	}
+	for _, f := range body.Faults {
+		if f.Code == "" {
+			t.Errorf("fault missing code: %+v", f)
+		}
+		if len(f.Paths) == 0 {
+			t.Errorf("fault missing paths: %+v", f)
+		}
+		if f.Message == "" {
+			t.Errorf("fault missing message: %+v", f)
+		}
+	}
+}
+
+func TestHandleConvertAcceptsBareDocument(t *testing.T) {
+	// When the "Envelop" checkbox is unchecked the editor sends a bare
+	// bill.Invoice (no envelope wrapper). handleConvert must wrap it on the
+	// fly rather than bouncing the request.
+	raw, ok := examples.Get("de-xrechnung")
+	if !ok {
+		t.Fatal("example not found")
+	}
+	r := httptest.NewRequest(http.MethodPost, "/_editor/convert?format=ubl-xrechnung", bytes.NewReader(raw))
+	w := httptest.NewRecorder()
+	handleConvert(w, r)
+	if w.Code != http.StatusOK {
+		t.Fatalf("status: got %d, want 200 — body: %s", w.Code, w.Body.String())
+	}
+	if !strings.HasPrefix(w.Body.String(), "<?xml") {
+		t.Fatalf("unexpected prefix: %s", head(w.Body.Bytes(), 80))
+	}
+}
+
+func TestHandleConvertUnknownFormat(t *testing.T) {
+	r := httptest.NewRequest(http.MethodPost, "/_editor/convert?format=nope", bytes.NewReader([]byte("{}")))
+	w := httptest.NewRecorder()
+	handleConvert(w, r)
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("status: got %d, want 400", w.Code)
+	}
+	var body map[string]any
+	if err := json.NewDecoder(w.Body).Decode(&body); err != nil {
+		t.Fatalf("decode body: %v", err)
+	}
+	if msg, _ := body["message"].(string); !strings.Contains(msg, "unknown format") {
+		t.Fatalf("unexpected message: %q", msg)
+	}
+}
+
+func head(b []byte, n int) string {
+	if len(b) < n {
+		return string(b)
+	}
+	return string(b[:n])
+}
diff --git a/editor/editor.go b/editor/editor.go
index 372f0ff..064f682 100644
--- a/editor/editor.go
+++ b/editor/editor.go
@@ -3,9 +3,11 @@ package editor
 
 import (
 	"embed"
+	"encoding/json"
 	"io/fs"
 	"net/http"
 
+	"github.com/invopop/gobl.dev/editor/examples"
 	popui "github.com/invopop/popui.go"
 )
 
@@ -26,13 +28,14 @@ const AssetPath = "/_editor"
 // Handler returns an http.HandlerFunc that renders the editor page.
 func Handler() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
+		initial := pickExampleFromAcceptLanguage(r.Header.Get("Accept-Language"))
 		w.Header().Set("Content-Type", "text/html; charset=utf-8")
-		_ = Page().Render(r.Context(), w)
+		_ = Page(initial.ID).Render(r.Context(), w)
 	}
 }
 
-// RegisterAssets registers the editor and popui static asset handlers
-// onto the given ServeMux.
+// RegisterAssets registers the editor and popui static asset handlers,
+// plus editor-private JSON routes, onto the given ServeMux.
 func RegisterAssets(mux *http.ServeMux) {
 	// PopUI assets at /_popui/ (embed FS contains assets/ subdirectory)
 	mux.Handle(popui.AssetPath+"/", http.StripPrefix(
@@ -42,4 +45,35 @@ func RegisterAssets(mux *http.ServeMux) {
 	mux.Handle(AssetPath+"/", http.StripPrefix(
 		AssetPath, http.FileServerFS(editorAssets),
 	))
+
+	// Editor-private JSON routes.
+	mux.HandleFunc("GET /_editor/examples", handleExamplesList)
+	mux.HandleFunc("GET /_editor/examples/{id}", handleExampleGet)
+	mux.HandleFunc("GET /_editor/formats", handleFormats)
+	mux.HandleFunc("POST /_editor/convert", handleConvert)
+}
+
+// bootstrap returns the initial state blob rendered into the page as a
+// JSON <script> tag and read by the Alpine editor component on boot.
+func bootstrap(initialExampleID string) map[string]any {
+	return map[string]any{
+		"initialExampleID": initialExampleID,
+		"examples":         examples.All(),
+		"formats":          formatList(),
+	}
+}
+
+func handleExamplesList(w http.ResponseWriter, _ *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	_ = json.NewEncoder(w).Encode(examples.All())
+}
+
+func handleExampleGet(w http.ResponseWriter, r *http.Request) {
+	data, ok := examples.Get(r.PathValue("id"))
+	if !ok {
+		http.NotFound(w, r)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	_, _ = w.Write(data)
 }
diff --git a/editor/editor.templ b/editor/editor.templ
index c9e2d2d..d1bc286 100644
--- a/editor/editor.templ
+++ b/editor/editor.templ
@@ -1,18 +1,21 @@
 package editor
 
 import (
+	"github.com/invopop/gobl.dev/editor/examples"
 	"github.com/invopop/icons"
 	popui "github.com/invopop/popui.go"
 	"github.com/invopop/popui.go/props"
 	"path"
 )
 
-templ Page() {
+templ Page(initialExampleID string) {
 	@popui.App(props.App{
 		Title: "GOBL Editor",
 		Importmap: []props.Import{
 			{Name: "codemirror", URL: "https://esm.sh/codemirror@6.0.1"},
 			{Name: "@codemirror/state", URL: "https://esm.sh/@codemirror/state@6"},
+			{Name: "@codemirror/view", URL: "https://esm.sh/@codemirror/view@6"},
+			{Name: "@codemirror/lang-xml", URL: "https://esm.sh/@codemirror/lang-xml@6"},
 			{Name: "codemirror-json-schema", URL: "https://esm.sh/@invopop/codemirror-json-schema@0.9.3"},
 			{Name: "@fsegurai/codemirror-theme-vscode-light", URL: "https://esm.sh/@fsegurai/codemirror-theme-vscode-light@6"},
 			{Name: "@fsegurai/codemirror-theme-vscode-dark", URL: "https://esm.sh/@fsegurai/codemirror-theme-vscode-dark@6"},
@@ -26,12 +29,14 @@ templ Page() {
 		Scripts: []props.Script{
 			{Src: path.Join(AssetPath, popui.Versioned(editorAssets, "editor-data.js"))},
 		},
-		Head: headExtras(),
+		Head: headExtras(initialExampleID),
 		Data: "editor",
 	}) {
 		@popui.Header(props.Header{
 			Title: goblTitle(),
 		}) {
+			@examplePicker()
+			@formatPicker()
 			<template x-if="success > 0">
 				@popui.FlashMessage(props.FlashMessage{
 					Type:    "success",
@@ -86,13 +91,61 @@ templ Page() {
 					</template>
 				</details>
 			</div>
-			<div id="editor-container">
-				@editorSkeleton()
+			<div id="editor-container" class="flex flex-1 min-h-0">
+				<div id="editor-pane" class="flex-1 min-w-0 flex flex-col">
+					@editorSkeleton()
+				</div>
+				<div id="viewer-pane" x-show="format" x-cloak class="flex-1 min-w-0 border-l border-border flex flex-col">
+					<div id="viewer-content" class="flex-1 min-h-0 overflow-hidden relative">
+						<div class="absolute top-2 right-3 text-xs text-icon-default-secondary z-10" x-show="viewerLoading">Converting…</div>
+						<template x-if="viewerMode === 'html'">
+							<iframe sandbox="allow-same-origin" class="w-full h-full border-0 bg-white" :srcdoc="viewerHTML"></iframe>
+						</template>
+						<template x-if="viewerMode === 'xml'">
+							<div id="viewer-xml" class="h-full"></div>
+						</template>
+					</div>
+				</div>
 			</div>
 		}
 	}
 }
 
+templ examplePicker() {
+	<label class="flex items-center gap-2 text-sm">
+		<span class="text-icon-default-secondary">Example</span>
+		<select
+			x-model="exampleID"
+			@change="loadExample(exampleID)"
+			class="bg-background border border-border rounded px-2 py-1 focus:outline-none focus:ring-1 focus:ring-primary"
+		>
+			for _, g := range examples.Grouped() {
+				<optgroup label={ g.Type }>
+					for _, e := range g.Items {
+						<option value={ e.ID }>{ e.Label }</option>
+					}
+				</optgroup>
+			}
+		</select>
+	</label>
+}
+
+templ formatPicker() {
+	<label class="flex items-center gap-2 text-sm">
+		<span class="text-icon-default-secondary">Viewer</span>
+		<select
+			x-model="format"
+			@change="onFormatChange()"
+			class="bg-background border border-border rounded px-2 py-1 focus:outline-none focus:ring-1 focus:ring-primary"
+		>
+			<option value="">None</option>
+			for _, f := range formatList() {
+				<option value={ f.ID }>{ f.Label }</option>
+			}
+		</select>
+	</label>
+}
+
 templ editorSkeleton() {
 	<div class="flex h-full animate-pulse">
 		<div class="w-12 border-r border-border bg-muted/30 flex flex-col items-end gap-1 pt-1 pr-2">
@@ -122,13 +175,23 @@ templ editorSkeleton() {
 	</div>
 }
 
-templ headExtras() {
+templ headExtras(initialExampleID string) {
 	<link rel="icon" href="/favicon.svg" type="image/svg+xml"/>
 	<script>
 		if (localStorage.getItem("dark-mode") === "true") {
 			document.documentElement.classList.add("dark");
 		}
+		// Ready promise shared between editor.js (resolver) and editor-data.js
+		// (awaiter). Declared here so it exists before either of them runs —
+		// the editor module is deferred and static imports complete after
+		// alpine:init may have already fired.
+		window._cmReady = new Promise((r) => { window._cmReadyResolve = r; });
 	</script>
+	@bootstrapData(initialExampleID)
+}
+
+templ bootstrapData(initialExampleID string) {
+	@templ.JSONScript("editor-bootstrap", bootstrap(initialExampleID))
 }
 
 templ darkModeToggle() {
diff --git a/editor/editor_templ.go b/editor/editor_templ.go
index 8c2e668..d4bae81 100644
--- a/editor/editor_templ.go
+++ b/editor/editor_templ.go
@@ -1,6 +1,6 @@
 // Code generated by templ - DO NOT EDIT.
 
-// templ: version: v0.3.977
+// templ: version: v0.3.1001
 package editor
 
 //lint:file-ignore SA4006 This context is only used if a nested component is present.
@@ -9,13 +9,14 @@ import "github.com/a-h/templ"
 import templruntime "github.com/a-h/templ/runtime"
 
 import (
+	"github.com/invopop/gobl.dev/editor/examples"
 	"github.com/invopop/icons"
 	popui "github.com/invopop/popui.go"
 	"github.com/invopop/popui.go/props"
 	"path"
 )
 
-func Page() templ.Component {
+func Page(initialExampleID string) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -60,7 +61,19 @@ func Page() templ.Component {
 					}()
 				}
 				ctx = templ.InitializeContext(ctx)
-				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, "<template x-if=\"success > 0\">")
+				templ_7745c5c3_Err = examplePicker().Render(ctx, templ_7745c5c3_Buffer)
+				if templ_7745c5c3_Err != nil {
+					return templ_7745c5c3_Err
+				}
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 1, " ")
+				if templ_7745c5c3_Err != nil {
+					return templ_7745c5c3_Err
+				}
+				templ_7745c5c3_Err = formatPicker().Render(ctx, templ_7745c5c3_Buffer)
+				if templ_7745c5c3_Err != nil {
+					return templ_7745c5c3_Err
+				}
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 2, " <template x-if=\"success > 0\">")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
@@ -74,7 +87,7 @@ func Page() templ.Component {
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
-				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 2, "</template>")
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 3, "</template>")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
@@ -102,7 +115,7 @@ func Page() templ.Component {
 					if templ_7745c5c3_Err != nil {
 						return templ_7745c5c3_Err
 					}
-					templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 3, " Envelop")
+					templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 4, " Envelop")
 					if templ_7745c5c3_Err != nil {
 						return templ_7745c5c3_Err
 					}
@@ -116,7 +129,7 @@ func Page() templ.Component {
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
-				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 4, " ")
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 5, " ")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
@@ -132,7 +145,7 @@ func Page() templ.Component {
 						}()
 					}
 					ctx = templ.InitializeContext(ctx)
-					templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 5, "Build")
+					templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 6, "Build")
 					if templ_7745c5c3_Err != nil {
 						return templ_7745c5c3_Err
 					}
@@ -149,7 +162,7 @@ func Page() templ.Component {
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
-				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 6, " ")
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 7, " ")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
@@ -165,7 +178,7 @@ func Page() templ.Component {
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
-			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 7, " ")
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 8, " ")
 			if templ_7745c5c3_Err != nil {
 				return templ_7745c5c3_Err
 			}
@@ -181,7 +194,7 @@ func Page() templ.Component {
 					}()
 				}
 				ctx = templ.InitializeContext(ctx)
-				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 8, "<div id=\"errors\" x-show=\"error\" x-cloak class=\"border-b border-border px-4 py-2 text-sm overflow-y-auto max-h-[200px] shrink-0\"><details open><summary class=\"cursor-pointer text-red-600 font-semibold\" x-text=\"error?.message || 'Error'\"></summary><template x-if=\"error?.faults?.length\"><div><template x-for=\"f in error.faults\" :key=\"f.message + f.paths?.join()\"><div class=\"fault\"><span class=\"code\" x-show=\"f.code\" x-text=\"'[' + f.code + ']'\"></span> <span class=\"path\" x-text=\"f.paths?.join(', ') || ''\"></span> <span class=\"msg\" x-text=\"f.message\"></span></div></template></div></template></details></div><div id=\"editor-container\">")
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 9, "<div id=\"errors\" x-show=\"error\" x-cloak class=\"border-b border-border px-4 py-2 text-sm overflow-y-auto max-h-[200px] shrink-0\"><details open><summary class=\"cursor-pointer text-red-600 font-semibold\" x-text=\"error?.message || 'Error'\"></summary><template x-if=\"error?.faults?.length\"><div><template x-for=\"f in error.faults\" :key=\"f.message + f.paths?.join()\"><div class=\"fault\"><span class=\"code\" x-show=\"f.code\" x-text=\"'[' + f.code + ']'\"></span> <span class=\"path\" x-text=\"f.paths?.join(', ') || ''\"></span> <span class=\"msg\" x-text=\"f.message\"></span></div></template></div></template></details></div><div id=\"editor-container\" class=\"flex flex-1 min-h-0\"><div id=\"editor-pane\" class=\"flex-1 min-w-0 flex flex-col\">")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
@@ -189,7 +202,7 @@ func Page() templ.Component {
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
-				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 9, "</div>")
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 10, "</div><div id=\"viewer-pane\" x-show=\"format\" x-cloak class=\"flex-1 min-w-0 border-l border-border flex flex-col\"><div id=\"viewer-content\" class=\"flex-1 min-h-0 overflow-hidden relative\"><div class=\"absolute top-2 right-3 text-xs text-icon-default-secondary z-10\" x-show=\"viewerLoading\">Converting…</div><template x-if=\"viewerMode === 'html'\"><iframe sandbox=\"allow-same-origin\" class=\"w-full h-full border-0 bg-white\" :srcdoc=\"viewerHTML\"></iframe></template><template x-if=\"viewerMode === 'xml'\"><div id=\"viewer-xml\" class=\"h-full\"></div></template></div></div></div>")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
@@ -206,6 +219,8 @@ func Page() templ.Component {
 			Importmap: []props.Import{
 				{Name: "codemirror", URL: "https://esm.sh/codemirror@6.0.1"},
 				{Name: "@codemirror/state", URL: "https://esm.sh/@codemirror/state@6"},
+				{Name: "@codemirror/view", URL: "https://esm.sh/@codemirror/view@6"},
+				{Name: "@codemirror/lang-xml", URL: "https://esm.sh/@codemirror/lang-xml@6"},
 				{Name: "codemirror-json-schema", URL: "https://esm.sh/@invopop/codemirror-json-schema@0.9.3"},
 				{Name: "@fsegurai/codemirror-theme-vscode-light", URL: "https://esm.sh/@fsegurai/codemirror-theme-vscode-light@6"},
 				{Name: "@fsegurai/codemirror-theme-vscode-dark", URL: "https://esm.sh/@fsegurai/codemirror-theme-vscode-dark@6"},
@@ -219,7 +234,7 @@ func Page() templ.Component {
 			Scripts: []props.Script{
 				{Src: path.Join(AssetPath, popui.Versioned(editorAssets, "editor-data.js"))},
 			},
-			Head: headExtras(),
+			Head: headExtras(initialExampleID),
 			Data: "editor",
 		}).Render(templ.WithChildren(ctx, templ_7745c5c3_Var2), templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
@@ -229,7 +244,7 @@ func Page() templ.Component {
 	})
 }
 
-func editorSkeleton() templ.Component {
+func examplePicker() templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -250,19 +265,205 @@ func editorSkeleton() templ.Component {
 			templ_7745c5c3_Var7 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 10, "<div class=\"flex h-full animate-pulse\"><div class=\"w-12 border-r border-border bg-muted/30 flex flex-col items-end gap-1 pt-1 pr-2\">")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 11, "<label class=\"flex items-center gap-2 text-sm\"><span class=\"text-icon-default-secondary\">Example</span> <select x-model=\"exampleID\" @change=\"loadExample(exampleID)\" class=\"bg-background border border-border rounded px-2 py-1 focus:outline-none focus:ring-1 focus:ring-primary\">")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		for _, g := range examples.Grouped() {
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 12, "<optgroup label=\"")
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+			var templ_7745c5c3_Var8 string
+			templ_7745c5c3_Var8, templ_7745c5c3_Err = templ.JoinStringErrs(g.Type)
+			if templ_7745c5c3_Err != nil {
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `editor/editor.templ`, Line: 123, Col: 28}
+			}
+			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var8))
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 13, "\">")
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+			for _, e := range g.Items {
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 14, "<option value=\"")
+				if templ_7745c5c3_Err != nil {
+					return templ_7745c5c3_Err
+				}
+				var templ_7745c5c3_Var9 string
+				templ_7745c5c3_Var9, templ_7745c5c3_Err = templ.JoinStringErrs(e.ID)
+				if templ_7745c5c3_Err != nil {
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `editor/editor.templ`, Line: 125, Col: 26}
+				}
+				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var9))
+				if templ_7745c5c3_Err != nil {
+					return templ_7745c5c3_Err
+				}
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 15, "\">")
+				if templ_7745c5c3_Err != nil {
+					return templ_7745c5c3_Err
+				}
+				var templ_7745c5c3_Var10 string
+				templ_7745c5c3_Var10, templ_7745c5c3_Err = templ.JoinStringErrs(e.Label)
+				if templ_7745c5c3_Err != nil {
+					return templ.Error{Err: templ_7745c5c3_Err, FileName: `editor/editor.templ`, Line: 125, Col: 38}
+				}
+				_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var10))
+				if templ_7745c5c3_Err != nil {
+					return templ_7745c5c3_Err
+				}
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 16, "</option>")
+				if templ_7745c5c3_Err != nil {
+					return templ_7745c5c3_Err
+				}
+			}
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 17, "</optgroup>")
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 18, "</select></label>")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		return nil
+	})
+}
+
+func formatPicker() templ.Component {
+	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
+		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
+		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
+			return templ_7745c5c3_CtxErr
+		}
+		templ_7745c5c3_Buffer, templ_7745c5c3_IsBuffer := templruntime.GetBuffer(templ_7745c5c3_W)
+		if !templ_7745c5c3_IsBuffer {
+			defer func() {
+				templ_7745c5c3_BufErr := templruntime.ReleaseBuffer(templ_7745c5c3_Buffer)
+				if templ_7745c5c3_Err == nil {
+					templ_7745c5c3_Err = templ_7745c5c3_BufErr
+				}
+			}()
+		}
+		ctx = templ.InitializeContext(ctx)
+		templ_7745c5c3_Var11 := templ.GetChildren(ctx)
+		if templ_7745c5c3_Var11 == nil {
+			templ_7745c5c3_Var11 = templ.NopComponent
+		}
+		ctx = templ.ClearChildren(ctx)
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 19, "<label class=\"flex items-center gap-2 text-sm\"><span class=\"text-icon-default-secondary\">Viewer</span> <select x-model=\"format\" @change=\"onFormatChange()\" class=\"bg-background border border-border rounded px-2 py-1 focus:outline-none focus:ring-1 focus:ring-primary\"><option value=\"\">None</option> ")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		for _, f := range formatList() {
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 20, "<option value=\"")
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+			var templ_7745c5c3_Var12 string
+			templ_7745c5c3_Var12, templ_7745c5c3_Err = templ.JoinStringErrs(f.ID)
+			if templ_7745c5c3_Err != nil {
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `editor/editor.templ`, Line: 143, Col: 24}
+			}
+			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var12))
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 21, "\">")
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+			var templ_7745c5c3_Var13 string
+			templ_7745c5c3_Var13, templ_7745c5c3_Err = templ.JoinStringErrs(f.Label)
+			if templ_7745c5c3_Err != nil {
+				return templ.Error{Err: templ_7745c5c3_Err, FileName: `editor/editor.templ`, Line: 143, Col: 36}
+			}
+			_, templ_7745c5c3_Err = templ_7745c5c3_Buffer.WriteString(templ.EscapeString(templ_7745c5c3_Var13))
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+			templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 22, "</option>")
+			if templ_7745c5c3_Err != nil {
+				return templ_7745c5c3_Err
+			}
+		}
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 23, "</select></label>")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		return nil
+	})
+}
+
+func editorSkeleton() templ.Component {
+	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
+		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
+		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
+			return templ_7745c5c3_CtxErr
+		}
+		templ_7745c5c3_Buffer, templ_7745c5c3_IsBuffer := templruntime.GetBuffer(templ_7745c5c3_W)
+		if !templ_7745c5c3_IsBuffer {
+			defer func() {
+				templ_7745c5c3_BufErr := templruntime.ReleaseBuffer(templ_7745c5c3_Buffer)
+				if templ_7745c5c3_Err == nil {
+					templ_7745c5c3_Err = templ_7745c5c3_BufErr
+				}
+			}()
+		}
+		ctx = templ.InitializeContext(ctx)
+		templ_7745c5c3_Var14 := templ.GetChildren(ctx)
+		if templ_7745c5c3_Var14 == nil {
+			templ_7745c5c3_Var14 = templ.NopComponent
+		}
+		ctx = templ.ClearChildren(ctx)
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 24, "<div class=\"flex h-full animate-pulse\"><div class=\"w-12 border-r border-border bg-muted/30 flex flex-col items-end gap-1 pt-1 pr-2\">")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
 		for i := range 20 {
 			if i < 15 {
-				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 11, "<div class=\"h-4 w-4 rounded bg-muted\"></div>")
+				templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 25, "<div class=\"h-4 w-4 rounded bg-muted\"></div>")
 				if templ_7745c5c3_Err != nil {
 					return templ_7745c5c3_Err
 				}
 			}
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 12, "</div><div class=\"flex-1 flex flex-col gap-1 p-1 pl-4\"><div class=\"h-4 w-64 rounded bg-muted\"></div><div class=\"h-4 w-32 rounded bg-muted\"></div><div class=\"h-4 w-48 rounded bg-muted\"></div><div class=\"h-4 w-40 rounded bg-muted ml-4\"></div><div class=\"h-4 w-56 rounded bg-muted ml-8\"></div><div class=\"h-4 w-36 rounded bg-muted ml-4\"></div><div class=\"h-4 w-44 rounded bg-muted ml-4\"></div><div class=\"h-4 w-52 rounded bg-muted ml-8\"></div><div class=\"h-4 w-28 rounded bg-muted ml-8\"></div><div class=\"h-4 w-40 rounded bg-muted ml-4\"></div><div class=\"h-4 w-32 rounded bg-muted\"></div><div class=\"h-4 w-48 rounded bg-muted ml-4\"></div><div class=\"h-4 w-60 rounded bg-muted ml-8\"></div><div class=\"h-4 w-36 rounded bg-muted ml-4\"></div><div class=\"h-4 w-24 rounded bg-muted\"></div></div></div>")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 26, "</div><div class=\"flex-1 flex flex-col gap-1 p-1 pl-4\"><div class=\"h-4 w-64 rounded bg-muted\"></div><div class=\"h-4 w-32 rounded bg-muted\"></div><div class=\"h-4 w-48 rounded bg-muted\"></div><div class=\"h-4 w-40 rounded bg-muted ml-4\"></div><div class=\"h-4 w-56 rounded bg-muted ml-8\"></div><div class=\"h-4 w-36 rounded bg-muted ml-4\"></div><div class=\"h-4 w-44 rounded bg-muted ml-4\"></div><div class=\"h-4 w-52 rounded bg-muted ml-8\"></div><div class=\"h-4 w-28 rounded bg-muted ml-8\"></div><div class=\"h-4 w-40 rounded bg-muted ml-4\"></div><div class=\"h-4 w-32 rounded bg-muted\"></div><div class=\"h-4 w-48 rounded bg-muted ml-4\"></div><div class=\"h-4 w-60 rounded bg-muted ml-8\"></div><div class=\"h-4 w-36 rounded bg-muted ml-4\"></div><div class=\"h-4 w-24 rounded bg-muted\"></div></div></div>")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		return nil
+	})
+}
+
+func headExtras(initialExampleID string) templ.Component {
+	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
+		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
+		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
+			return templ_7745c5c3_CtxErr
+		}
+		templ_7745c5c3_Buffer, templ_7745c5c3_IsBuffer := templruntime.GetBuffer(templ_7745c5c3_W)
+		if !templ_7745c5c3_IsBuffer {
+			defer func() {
+				templ_7745c5c3_BufErr := templruntime.ReleaseBuffer(templ_7745c5c3_Buffer)
+				if templ_7745c5c3_Err == nil {
+					templ_7745c5c3_Err = templ_7745c5c3_BufErr
+				}
+			}()
+		}
+		ctx = templ.InitializeContext(ctx)
+		templ_7745c5c3_Var15 := templ.GetChildren(ctx)
+		if templ_7745c5c3_Var15 == nil {
+			templ_7745c5c3_Var15 = templ.NopComponent
+		}
+		ctx = templ.ClearChildren(ctx)
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 27, "<link rel=\"icon\" href=\"/favicon.svg\" type=\"image/svg+xml\"><script>\n\t\tif (localStorage.getItem(\"dark-mode\") === \"true\") {\n\t\t\tdocument.documentElement.classList.add(\"dark\");\n\t\t}\n\t\t// Ready promise shared between editor.js (resolver) and editor-data.js\n\t\t// (awaiter). Declared here so it exists before either of them runs —\n\t\t// the editor module is deferred and static imports complete after\n\t\t// alpine:init may have already fired.\n\t\twindow._cmReady = new Promise((r) => { window._cmReadyResolve = r; });\n\t</script>")
+		if templ_7745c5c3_Err != nil {
+			return templ_7745c5c3_Err
+		}
+		templ_7745c5c3_Err = bootstrapData(initialExampleID).Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -270,7 +471,7 @@ func editorSkeleton() templ.Component {
 	})
 }
 
-func headExtras() templ.Component {
+func bootstrapData(initialExampleID string) templ.Component {
 	return templruntime.GeneratedTemplate(func(templ_7745c5c3_Input templruntime.GeneratedComponentInput) (templ_7745c5c3_Err error) {
 		templ_7745c5c3_W, ctx := templ_7745c5c3_Input.Writer, templ_7745c5c3_Input.Context
 		if templ_7745c5c3_CtxErr := ctx.Err(); templ_7745c5c3_CtxErr != nil {
@@ -286,12 +487,12 @@ func headExtras() templ.Component {
 			}()
 		}
 		ctx = templ.InitializeContext(ctx)
-		templ_7745c5c3_Var8 := templ.GetChildren(ctx)
-		if templ_7745c5c3_Var8 == nil {
-			templ_7745c5c3_Var8 = templ.NopComponent
+		templ_7745c5c3_Var16 := templ.GetChildren(ctx)
+		if templ_7745c5c3_Var16 == nil {
+			templ_7745c5c3_Var16 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 13, "<link rel=\"icon\" href=\"/favicon.svg\" type=\"image/svg+xml\"><script>\n\t\tif (localStorage.getItem(\"dark-mode\") === \"true\") {\n\t\t\tdocument.documentElement.classList.add(\"dark\");\n\t\t}\n\t</script>")
+		templ_7745c5c3_Err = templ.JSONScript("editor-bootstrap", bootstrap(initialExampleID)).Render(ctx, templ_7745c5c3_Buffer)
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -315,12 +516,12 @@ func darkModeToggle() templ.Component {
 			}()
 		}
 		ctx = templ.InitializeContext(ctx)
-		templ_7745c5c3_Var9 := templ.GetChildren(ctx)
-		if templ_7745c5c3_Var9 == nil {
-			templ_7745c5c3_Var9 = templ.NopComponent
+		templ_7745c5c3_Var17 := templ.GetChildren(ctx)
+		if templ_7745c5c3_Var17 == nil {
+			templ_7745c5c3_Var17 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 14, "<button x-data=\"darkModeToggle\" @click=\"toggle\" class=\"flex items-center justify-center size-8 -mr-2 rounded-lg text-icon-default-secondary hover:text-icon hover:bg-background-default-secondary transition-colors cursor-pointer\" title=\"Toggle dark mode\"><div class=\"transition-transform duration-300\" :class=\"{ 'rotate-180': dark }\">")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 28, "<button x-data=\"darkModeToggle\" @click=\"toggle\" class=\"flex items-center justify-center size-8 -mr-2 rounded-lg text-icon-default-secondary hover:text-icon hover:bg-background-default-secondary transition-colors cursor-pointer\" title=\"Toggle dark mode\"><div class=\"transition-transform duration-300\" :class=\"{ 'rotate-180': dark }\">")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -328,7 +529,7 @@ func darkModeToggle() templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 15, "</div></button>")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 29, "</div></button>")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -352,12 +553,12 @@ func goblTitle() templ.Component {
 			}()
 		}
 		ctx = templ.InitializeContext(ctx)
-		templ_7745c5c3_Var10 := templ.GetChildren(ctx)
-		if templ_7745c5c3_Var10 == nil {
-			templ_7745c5c3_Var10 = templ.NopComponent
+		templ_7745c5c3_Var18 := templ.GetChildren(ctx)
+		if templ_7745c5c3_Var18 == nil {
+			templ_7745c5c3_Var18 = templ.NopComponent
 		}
 		ctx = templ.ClearChildren(ctx)
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 16, "<div class=\"flex items-center gap-2\">")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 30, "<div class=\"flex items-center gap-2\">")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
@@ -365,7 +566,7 @@ func goblTitle() templ.Component {
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
-		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 17, "GOBL Editor</div>")
+		templ_7745c5c3_Err = templruntime.WriteString(templ_7745c5c3_Buffer, 31, "GOBL Editor</div>")
 		if templ_7745c5c3_Err != nil {
 			return templ_7745c5c3_Err
 		}
diff --git a/editor/examples/catalog.go b/editor/examples/catalog.go
new file mode 100644
index 0000000..bce7b17
--- /dev/null
+++ b/editor/examples/catalog.go
@@ -0,0 +1,116 @@
+// Package examples holds curated starter invoices exposed through the editor.
+package examples
+
+import (
+	"embed"
+	"fmt"
+)
+
+// Example describes a curated starter document.
+type Example struct {
+	ID          string `json:"id"`
+	Label       string `json:"label"`
+	Type        string `json:"type"`
+	Country     string `json:"country"`
+	Addon       string `json:"addon,omitempty"`
+	Description string `json:"description,omitempty"`
+}
+
+// Group is a set of examples that share the same document Type. Returned by
+// Grouped in the order the types first appear in the catalog.
+type Group struct {
+	Type  string    `json:"type"`
+	Items []Example `json:"items"`
+}
+
+//go:embed *.json
+var files embed.FS
+
+// Document types. More may appear alongside Invoice as the catalog grows
+// (e.g. "Credit Note", "Delivery", "Payment").
+const (
+	TypeInvoice = "Invoice"
+)
+
+// catalog is the ordered list of available examples. Ordering: plain country
+// variant first, then addon variants, grouped by country alpha-code.
+var catalog = []Example{
+	{ID: "de", Label: "DE — Germany", Type: TypeInvoice, Country: "DE", Description: "Standard German VAT invoice."},
+	{ID: "de-xrechnung", Label: "DE — XRechnung", Type: TypeInvoice, Country: "DE", Addon: "de-xrechnung-v3", Description: "German public-sector e-invoice."},
+	{ID: "es", Label: "ES — Spain", Type: TypeInvoice, Country: "ES", Description: "Standard Spanish VAT invoice."},
+	{ID: "es-verifactu", Label: "ES — VERI*FACTU", Type: TypeInvoice, Country: "ES", Addon: "es-verifactu-v1", Description: "Spanish real-time VAT reporting (AEAT)."},
+	{ID: "es-tbai", Label: "ES — TicketBAI", Type: TypeInvoice, Country: "ES", Addon: "es-tbai-v1", Description: "Basque Country e-invoicing."},
+	{ID: "fr", Label: "FR — France", Type: TypeInvoice, Country: "FR", Description: "Standard French VAT invoice."},
+	{ID: "fr-facturx", Label: "FR — Factur-X", Type: TypeInvoice, Country: "FR", Addon: "fr-facturx-v1", Description: "French hybrid PDF/XML e-invoice."},
+	{ID: "gb", Label: "GB — United Kingdom", Type: TypeInvoice, Country: "GB", Description: "UK VAT invoice."},
+	{ID: "it-fatturapa", Label: "IT — FatturaPA", Type: TypeInvoice, Country: "IT", Addon: "it-sdi-v1", Description: "Italian SdI electronic invoice."},
+	{ID: "nl", Label: "NL — Netherlands", Type: TypeInvoice, Country: "NL", Description: "Dutch VAT invoice."},
+	{ID: "pt", Label: "PT — Portugal", Type: TypeInvoice, Country: "PT", Description: "Portuguese VAT invoice."},
+	{ID: "us", Label: "US — United States", Type: TypeInvoice, Country: "US", Description: "Basic sales-tax invoice."},
+}
+
+// All returns the curated examples in display order.
+func All() []Example {
+	return catalog
+}
+
+// Grouped returns the examples bucketed by Type, in the order each type
+// first appears in the catalog. Items within each group preserve their
+// catalog ordering.
+func Grouped() []Group {
+	groups := make([]Group, 0)
+	index := map[string]int{}
+	for _, e := range catalog {
+		i, ok := index[e.Type]
+		if !ok {
+			index[e.Type] = len(groups)
+			groups = append(groups, Group{Type: e.Type, Items: []Example{e}})
+			continue
+		}
+		groups[i].Items = append(groups[i].Items, e)
+	}
+	return groups
+}
+
+// Get returns the raw JSON for a given example ID.
+func Get(id string) ([]byte, bool) {
+	for _, e := range catalog {
+		if e.ID == id {
+			data, err := files.ReadFile(e.ID + ".json")
+			if err != nil {
+				return nil, false
+			}
+			return data, true
+		}
+	}
+	return nil, false
+}
+
+// Find returns the example metadata for a given ID.
+func Find(id string) (Example, bool) {
+	for _, e := range catalog {
+		if e.ID == id {
+			return e, true
+		}
+	}
+	return Example{}, false
+}
+
+// DefaultFor returns the preferred example for the given ISO-3166-1 alpha-2
+// country code (upper-case). It picks the first entry whose Country matches,
+// falling back to the US example if no match is found. The plain-country
+// variant (no addon) wins when both a plain and addon variant exist, because
+// of the ordering inside catalog.
+func DefaultFor(country string) Example {
+	for _, e := range catalog {
+		if e.Country == country {
+			return e
+		}
+	}
+	for _, e := range catalog {
+		if e.ID == "us" {
+			return e
+		}
+	}
+	panic(fmt.Errorf("examples: us fallback not found"))
+}
diff --git a/editor/examples/de-xrechnung.json b/editor/examples/de-xrechnung.json
new file mode 100644
index 0000000..d435b8c
--- /dev/null
+++ b/editor/examples/de-xrechnung.json
@@ -0,0 +1,78 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "$addons": ["de-xrechnung-v3"],
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One GmbH",
+    "tax_id": {
+      "country": "DE",
+      "code": "111111125"
+    },
+    "inboxes": [
+      {"email": "billing@example.com"}
+    ],
+    "people": [
+      {
+        "name": {"given": "John", "surname": "Doe"},
+        "emails": [{"addr": "billing@example.com"}]
+      }
+    ],
+    "addresses": [
+      {
+        "num": "16",
+        "street": "Dietmar-Hopp-Allee",
+        "locality": "Walldorf",
+        "code": "69190",
+        "country": "DE"
+      }
+    ],
+    "telephones": [{"num": "+49100200300"}]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {
+      "country": "DE",
+      "code": "282741168"
+    },
+    "inboxes": [
+      {"email": "billing@example.com"}
+    ],
+    "emails": [{"addr": "email@sample.com"}],
+    "addresses": [
+      {
+        "num": "25",
+        "street": "Werner-Heisenberg-Allee",
+        "locality": "München",
+        "code": "80939",
+        "country": "DE"
+      }
+    ],
+    "telephones": [{"num": "+49100200300"}]
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00",
+        "unit": "h"
+      },
+      "taxes": [
+        {"cat": "VAT", "rate": "standard"}
+      ]
+    }
+  ],
+  "ordering": {"code": "12345"},
+  "payment": {
+    "instructions": {
+      "key": "credit-transfer+sepa",
+      "credit_transfer": [
+        {"iban": "DE89370400440532013000", "name": "Random Bank Co."}
+      ]
+    },
+    "terms": {"detail": "Please pay within 10 days"}
+  }
+}
diff --git a/editor/examples/de.json b/editor/examples/de.json
new file mode 100644
index 0000000..5d01af7
--- /dev/null
+++ b/editor/examples/de.json
@@ -0,0 +1,55 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One GmbH",
+    "tax_id": {
+      "country": "DE",
+      "code": "111111125"
+    },
+    "addresses": [
+      {
+        "num": "16",
+        "street": "Dietmar-Hopp-Allee",
+        "locality": "Walldorf",
+        "code": "69190",
+        "country": "DE"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {
+      "country": "DE",
+      "code": "282741168"
+    },
+    "addresses": [
+      {
+        "num": "25",
+        "street": "Werner-Heisenberg-Allee",
+        "locality": "München",
+        "code": "80939",
+        "country": "DE"
+      }
+    ]
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00",
+        "unit": "h"
+      },
+      "taxes": [
+        {
+          "cat": "VAT",
+          "rate": "standard"
+        }
+      ]
+    }
+  ]
+}
diff --git a/editor/examples/es-tbai.json b/editor/examples/es-tbai.json
new file mode 100644
index 0000000..ceb8619
--- /dev/null
+++ b/editor/examples/es-tbai.json
@@ -0,0 +1,50 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "$addons": ["es-tbai-v1"],
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One S.L.",
+    "tax_id": {
+      "country": "ES",
+      "code": "B98602642"
+    },
+    "emails": [{"addr": "billing@example.com"}],
+    "addresses": [
+      {
+        "num": "42",
+        "street": "San Frantzisko",
+        "locality": "Bilbo",
+        "region": "Bizkaia",
+        "code": "48003",
+        "country": "ES"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {
+      "country": "ES",
+      "code": "54387763P"
+    }
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "key": "services",
+        "name": "Development services",
+        "price": "90.00",
+        "unit": "h"
+      },
+      "taxes": [
+        {"cat": "VAT", "rate": "standard"}
+      ]
+    }
+  ],
+  "notes": [
+    {"key": "general", "text": "Sample TicketBAI invoice"}
+  ]
+}
diff --git a/editor/examples/es-verifactu.json b/editor/examples/es-verifactu.json
new file mode 100644
index 0000000..f6bb21b
--- /dev/null
+++ b/editor/examples/es-verifactu.json
@@ -0,0 +1,49 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "$addons": ["es-verifactu-v1"],
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One S.L.",
+    "tax_id": {
+      "country": "ES",
+      "code": "B98602642"
+    },
+    "emails": [{"addr": "billing@example.com"}],
+    "addresses": [
+      {
+        "num": "42",
+        "street": "Calle Pradillo",
+        "locality": "Madrid",
+        "region": "Madrid",
+        "code": "28002",
+        "country": "ES"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {
+      "country": "ES",
+      "code": "54387763P"
+    }
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00",
+        "unit": "h"
+      },
+      "taxes": [
+        {"cat": "VAT", "rate": "standard"}
+      ]
+    }
+  ],
+  "notes": [
+    {"key": "general", "text": "Sample VERI*FACTU invoice"}
+  ]
+}
diff --git a/editor/examples/es.json b/editor/examples/es.json
new file mode 100644
index 0000000..338a369
--- /dev/null
+++ b/editor/examples/es.json
@@ -0,0 +1,44 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One S.L.",
+    "tax_id": {
+      "country": "ES",
+      "code": "B98602642"
+    },
+    "addresses": [
+      {
+        "num": "42",
+        "street": "Calle Pradillo",
+        "locality": "Madrid",
+        "region": "Madrid",
+        "code": "28002",
+        "country": "ES"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {
+      "country": "ES",
+      "code": "54387763P"
+    }
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00",
+        "unit": "h"
+      },
+      "taxes": [
+        {"cat": "VAT", "rate": "standard"}
+      ]
+    }
+  ]
+}
diff --git a/editor/examples/fr-facturx.json b/editor/examples/fr-facturx.json
new file mode 100644
index 0000000..bc76a3c
--- /dev/null
+++ b/editor/examples/fr-facturx.json
@@ -0,0 +1,61 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "$addons": ["fr-facturx-v1"],
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One SAS",
+    "tax_id": {
+      "country": "FR",
+      "code": "44732829320"
+    },
+    "emails": [{"addr": "billing@example.com"}],
+    "addresses": [
+      {
+        "num": "1",
+        "street": "Rue de Rivoli",
+        "locality": "Paris",
+        "code": "75001",
+        "country": "FR"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {
+      "country": "FR",
+      "code": "356000000"
+    },
+    "emails": [{"addr": "email@sample.com"}],
+    "addresses": [
+      {
+        "num": "1",
+        "street": "Rue Sundacsakn",
+        "locality": "Saint-Germain-En-Laye",
+        "code": "75050",
+        "country": "FR"
+      }
+    ]
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00"
+      },
+      "discounts": [
+        {"percent": "10%", "reason": "Special discount"}
+      ],
+      "taxes": [
+        {"cat": "VAT", "percent": "20%"}
+      ]
+    }
+  ],
+  "payment": {
+    "instructions": {"key": "card"},
+    "terms": {"detail": "Please pay within 10 days"}
+  }
+}
diff --git a/editor/examples/fr.json b/editor/examples/fr.json
new file mode 100644
index 0000000..db07664
--- /dev/null
+++ b/editor/examples/fr.json
@@ -0,0 +1,51 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One SAS",
+    "tax_id": {
+      "country": "FR",
+      "code": "44732829320"
+    },
+    "addresses": [
+      {
+        "num": "1",
+        "street": "Rue de Rivoli",
+        "locality": "Paris",
+        "code": "75001",
+        "country": "FR"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {
+      "country": "FR",
+      "code": "356000000"
+    },
+    "addresses": [
+      {
+        "num": "1",
+        "street": "Rue Sundacsakn",
+        "locality": "Saint-Germain-En-Laye",
+        "code": "75050",
+        "country": "FR"
+      }
+    ]
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00"
+      },
+      "taxes": [
+        {"cat": "VAT", "percent": "20%"}
+      ]
+    }
+  ]
+}
diff --git a/editor/examples/gb.json b/editor/examples/gb.json
new file mode 100644
index 0000000..9c1e074
--- /dev/null
+++ b/editor/examples/gb.json
@@ -0,0 +1,45 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "currency": "GBP",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One Ltd.",
+    "tax_id": {
+      "country": "GB",
+      "code": "844281425"
+    },
+    "addresses": [
+      {
+        "num": "10",
+        "street": "King's Road",
+        "locality": "London",
+        "code": "SW3 4UD",
+        "country": "GB"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Customer",
+    "tax_id": {
+      "country": "GB"
+    }
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00",
+        "unit": "h"
+      },
+      "taxes": [
+        {
+          "cat": "VAT",
+          "percent": "20%"
+        }
+      ]
+    }
+  ]
+}
diff --git a/editor/examples/it-fatturapa.json b/editor/examples/it-fatturapa.json
new file mode 100644
index 0000000..76d3032
--- /dev/null
+++ b/editor/examples/it-fatturapa.json
@@ -0,0 +1,64 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "$addons": ["it-sdi-v1"],
+  "series": "FT",
+  "code": "001",
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "tax": {
+    "prices_include": "VAT"
+  },
+  "type": "standard",
+  "supplier": {
+    "name": "Company Name S.r.l.",
+    "tax_id": {
+      "country": "IT",
+      "code": "12345678903"
+    },
+    "registration": {
+      "capital": "50000.00",
+      "currency": "EUR",
+      "entry": "123456",
+      "office": "RM"
+    },
+    "addresses": [
+      {
+        "num": "102",
+        "street": "Via California",
+        "locality": "Palermo",
+        "region": "PA",
+        "code": "33213",
+        "country": "IT"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Monica Bellucci",
+    "tax_id": {"country": "IT"},
+    "identities": [
+      {"key": "it-fiscal-code", "code": "RSSGNN60R30H501U"}
+    ],
+    "addresses": [
+      {
+        "num": "23",
+        "street": "Via dei Mille",
+        "locality": "Firenze",
+        "region": "FI",
+        "code": "00100",
+        "country": "IT"
+      }
+    ]
+  },
+  "lines": [
+    {
+      "quantity": "1",
+      "item": {
+        "name": "Cleaning services",
+        "price": "125.00"
+      },
+      "taxes": [
+        {"cat": "VAT", "rate": "standard"}
+      ]
+    }
+  ]
+}
diff --git a/editor/examples/nl.json b/editor/examples/nl.json
new file mode 100644
index 0000000..a3d438b
--- /dev/null
+++ b/editor/examples/nl.json
@@ -0,0 +1,40 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One B.V.",
+    "tax_id": {
+      "country": "NL",
+      "code": "000099995B57"
+    },
+    "addresses": [
+      {
+        "num": "55",
+        "street": "Herengracht",
+        "locality": "Amsterdam",
+        "code": "1015 BN",
+        "country": "NL"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {"country": "NL"}
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00",
+        "unit": "h"
+      },
+      "taxes": [
+        {"cat": "VAT", "rate": "standard"}
+      ]
+    }
+  ]
+}
diff --git a/editor/examples/pt.json b/editor/examples/pt.json
new file mode 100644
index 0000000..bbd3fe3
--- /dev/null
+++ b/editor/examples/pt.json
@@ -0,0 +1,40 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "currency": "EUR",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Provide One Lda.",
+    "tax_id": {
+      "country": "PT",
+      "code": "503504924"
+    },
+    "addresses": [
+      {
+        "num": "12",
+        "street": "Rua Augusta",
+        "locality": "Lisboa",
+        "code": "1100-053",
+        "country": "PT"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Consumer",
+    "tax_id": {"country": "PT"}
+  },
+  "lines": [
+    {
+      "quantity": "20",
+      "item": {
+        "name": "Development services",
+        "price": "90.00",
+        "unit": "h"
+      },
+      "taxes": [
+        {"cat": "VAT", "rate": "standard"}
+      ]
+    }
+  ]
+}
diff --git a/editor/examples/us.json b/editor/examples/us.json
new file mode 100644
index 0000000..9474bf3
--- /dev/null
+++ b/editor/examples/us.json
@@ -0,0 +1,40 @@
+{
+  "$schema": "https://gobl.org/draft-0/bill/invoice",
+  "currency": "USD",
+  "issue_date": "2026-01-15",
+  "series": "SAMPLE",
+  "code": "001",
+  "supplier": {
+    "name": "Acme Inc.",
+    "tax_id": {
+      "country": "US"
+    },
+    "addresses": [
+      {
+        "street": "123 Market Street",
+        "locality": "San Francisco",
+        "region": "CA",
+        "code": "94103",
+        "country": "US"
+      }
+    ]
+  },
+  "customer": {
+    "name": "Sample Customer"
+  },
+  "lines": [
+    {
+      "quantity": "10",
+      "item": {
+        "name": "Development Services",
+        "price": "100.00"
+      },
+      "taxes": [
+        {
+          "cat": "ST",
+          "percent": "8.25%"
+        }
+      ]
+    }
+  ]
+}
diff --git a/editor/geo.go b/editor/geo.go
new file mode 100644
index 0000000..f27d53d
--- /dev/null
+++ b/editor/geo.go
@@ -0,0 +1,52 @@
+package editor
+
+import (
+	"strings"
+
+	"github.com/invopop/gobl.dev/editor/examples"
+)
+
+// pickExampleFromAcceptLanguage walks an Accept-Language header in order of
+// appearance (ignoring q-weights, close enough for a default picker) and
+// returns the first curated example whose country matches a tag's region.
+// Falls back to the US example if no tag yields a match.
+func pickExampleFromAcceptLanguage(header string) examples.Example {
+	for _, raw := range strings.Split(header, ",") {
+		tag := strings.TrimSpace(raw)
+		if i := strings.Index(tag, ";"); i >= 0 {
+			tag = tag[:i]
+		}
+		region := regionFromTag(tag)
+		if region == "" {
+			continue
+		}
+		for _, e := range examples.All() {
+			if e.Country == region {
+				return e
+			}
+		}
+	}
+	return examples.DefaultFor("US")
+}
+
+// regionFromTag extracts the ISO-3166-1 alpha-2 region code from a BCP-47 tag
+// like "en-GB" or "es-419". Returns the region in upper-case, or an empty
+// string if no two-letter region is present.
+func regionFromTag(tag string) string {
+	parts := strings.Split(tag, "-")
+	for _, p := range parts[1:] {
+		if len(p) == 2 && isAlpha(p) {
+			return strings.ToUpper(p)
+		}
+	}
+	return ""
+}
+
+func isAlpha(s string) bool {
+	for _, r := range s {
+		if !((r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z')) {
+			return false
+		}
+	}
+	return true
+}
diff --git a/editor/geo_test.go b/editor/geo_test.go
new file mode 100644
index 0000000..f13c220
--- /dev/null
+++ b/editor/geo_test.go
@@ -0,0 +1,31 @@
+package editor
+
+import "testing"
+
+func TestPickExampleFromAcceptLanguage(t *testing.T) {
+	cases := []struct {
+		name   string
+		header string
+		wantID string
+	}{
+		{"empty falls back to US", "", "us"},
+		{"nonsense falls back to US", "xx,yy", "us"},
+		{"tag without region", "en", "us"},
+		{"en-US", "en-US", "us"},
+		{"it-IT maps to IT example", "it-IT", "it-fatturapa"},
+		{"es-ES maps to first ES variant", "es-ES", "es"},
+		{"de-DE maps to DE plain", "de-DE", "de"},
+		{"fr-FR maps to FR plain", "fr-FR", "fr"},
+		{"fallback through list", "xx,de-DE,fr-FR", "de"},
+		{"q-suffix stripped", "en-GB;q=0.9,fr-FR;q=0.8", "gb"},
+		{"region in third position", "zh-Hans-NL", "nl"},
+	}
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			got := pickExampleFromAcceptLanguage(c.header)
+			if got.ID != c.wantID {
+				t.Fatalf("got %q, want %q", got.ID, c.wantID)
+			}
+		})
+	}
+}
diff --git a/go.mod b/go.mod
index 8d44145..80d5650 100644
--- a/go.mod
+++ b/go.mod
@@ -9,10 +9,13 @@ require (
 	github.com/invopop/gobl v0.502.2
 	github.com/invopop/gobl.br.nfe v0.0.1
 	github.com/invopop/gobl.br.nfse v0.0.1
+	github.com/invopop/gobl.cii v0.39.0
 	github.com/invopop/gobl.fr.ctc v0.0.4
-	github.com/invopop/gobl.mx.cfdi v0.61.0
-	github.com/invopop/gobl.pt.saft v0.0.1
+	github.com/invopop/gobl.html v0.101.0
+	github.com/invopop/gobl.mx.cfdi v0.62.0
+	github.com/invopop/gobl.pt.saft v0.0.5
 	github.com/invopop/gobl.sa.zatca v0.0.2
+	github.com/invopop/gobl.ubl v0.56.0
 	github.com/invopop/icons v0.14.0
 	github.com/invopop/popui.go v0.30.0
 	github.com/invopop/yaml v0.3.1
@@ -20,16 +23,17 @@ require (
 	github.com/mark3labs/mcp-go v0.46.0
 	github.com/spf13/cobra v1.9.1
 	github.com/stretchr/testify v1.11.1
-	gitlab.com/flimzy/testy v0.14.0
+	gitlab.com/flimzy/testy v0.15.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
-	cloud.google.com/go v0.118.0 // indirect
+	cloud.google.com/go v0.119.0 // indirect
 	github.com/Masterminds/semver/v3 v3.3.1 // indirect
 	github.com/Oudwins/tailwind-merge-go v0.2.1 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
 	github.com/bahlo/generic-list-go v0.2.0 // indirect
+	github.com/beevik/etree v1.6.0 // indirect
 	github.com/buger/jsonparser v1.1.2 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
 	github.com/expr-lang/expr v1.17.8 // indirect
@@ -37,22 +41,31 @@ require (
 	github.com/google/jsonschema-go v0.4.2 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/invopop/ctxi18n v0.9.0 // indirect
 	github.com/invopop/jsonschema v0.14.0 // indirect
+	github.com/invopop/validation v0.8.0 // indirect
+	github.com/invopop/xmlctx v0.13.0 // indirect
+	github.com/invopop/xmldsig v0.14.0 // indirect
+	github.com/jonboulle/clockwork v0.5.0 // indirect
 	github.com/labstack/echo/v4 v4.15.0 // indirect
 	github.com/labstack/gommon v0.4.2 // indirect
 	github.com/mattn/go-colorable v0.1.14 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/pb33f/ordered-map/v2 v2.3.1 // indirect
+	github.com/piglig/go-qr v0.2.4 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/russellhaering/goxmldsig v1.6.0 // indirect
 	github.com/spf13/cast v1.7.1 // indirect
 	github.com/spf13/pflag v1.0.6 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasttemplate v1.2.2 // indirect
 	github.com/yosida95/uritemplate/v3 v3.0.2 // indirect
+	github.com/yuin/goldmark v1.4.13 // indirect
 	go.yaml.in/yaml/v4 v4.0.0-rc.2 // indirect
 	golang.org/x/crypto v0.53.0 // indirect
 	golang.org/x/net v0.56.0 // indirect
 	golang.org/x/sys v0.46.0 // indirect
 	golang.org/x/text v0.38.0 // indirect
+	software.sslmate.com/src/go-pkcs12 v0.7.0 // indirect
 )
diff --git a/go.sum b/go.sum
index c023849..6127302 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,5 @@
-cloud.google.com/go v0.118.0 h1:tvZe1mgqRxpiVa3XlIGMiPcEUbP1gNXELgD4y/IXmeQ=
-cloud.google.com/go v0.118.0/go.mod h1:zIt2pkedt/mo+DQjcT4/L3NDxzHPR29j5HcclNH+9PM=
+cloud.google.com/go v0.119.0 h1:tw7OjErMzJKbbjaEHkrt60KQrK5Wus/boCZ7tm5/RNE=
+cloud.google.com/go v0.119.0/go.mod h1:fwB8QLzTcNevxqi8dcpR+hoMIs3jBherGS9VUBDAW08=
 github.com/LastPossum/kamino v0.0.2 h1:Zry5lS7x7TTU1hzzk3Utnp+rX8kk/wWhuW52Ha9As+U=
 github.com/LastPossum/kamino v0.0.2/go.mod h1:H8Qm+6DGeNOoXk9hHIOEAQWS9nbo0YwK32pC/7REsOE=
 github.com/Masterminds/semver/v3 v3.3.1 h1:QtNSWtVZ3nBfk8mAOu/B6v7FMJ+NHTIgUPi7rj+4nv4=
@@ -12,6 +12,8 @@ github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3d
 github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
 github.com/bahlo/generic-list-go v0.2.0 h1:5sz/EEAK+ls5wF+NeqDpk5+iNdMDXrh3z3nPnH1Wvgk=
 github.com/bahlo/generic-list-go v0.2.0/go.mod h1:2KvAjgMlE5NNynlg/5iLrrCCZ2+5xWbdbCW3pNTGyYg=
+github.com/beevik/etree v1.6.0 h1:u8Kwy8pp9D9XeITj2Z0XtA5qqZEmtJtuXZRQi+j03eE=
+github.com/beevik/etree v1.6.0/go.mod h1:bh4zJxiIr62SOf9pRzN7UUYaEDa9HEKafK25+sLc0Gc=
 github.com/buger/jsonparser v1.1.2 h1:frqHqw7otoVbk5M8LlE/L7HTnIq2v9RX6EJ48i9AxJk=
 github.com/buger/jsonparser v1.1.2/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
 github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
@@ -33,28 +35,46 @@ github.com/imdario/mergo v0.3.16 h1:wwQJbIsHYGMUyLSPrEq1CT16AhnhNJQ51+4fdHUnCl4=
 github.com/imdario/mergo v0.3.16/go.mod h1:WBLT9ZmE3lPoWsEzCh9LPo3TiwVN+ZKEjmz+hD27ysY=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/invopop/ctxi18n v0.9.0 h1:BIia4u4OngaHVn/7gvK0w6lccOXVtad8xU0KgJ+mnVA=
+github.com/invopop/ctxi18n v0.9.0/go.mod h1:1Osw+JGYA+anHt0Z4reF36r5FtGHYjGQ+m1X7keIhPc=
 github.com/invopop/gobl v0.502.2 h1:guH++uYsy5RjCjn7qGNwFq1xWLceNx0Pmjz/Fm2KCRw=
 github.com/invopop/gobl v0.502.2/go.mod h1:HmiEdQreTSQYyNbhs81VKTmI7BAJKYC/6enh9RDwnE0=
 github.com/invopop/gobl.br.nfe v0.0.1 h1:ywJycz2wiyeNygbRhuRJg52gTnIECsbZ5+pGFqh3eyE=
 github.com/invopop/gobl.br.nfe v0.0.1/go.mod h1:ZIJSVz5257xciD+RkBhyvqjtS46Pgw23idTca6A8ZIk=
 github.com/invopop/gobl.br.nfse v0.0.1 h1:BdwNiG7vk7bPMgE4m102P+UysOxmYWhOKIDfFI6RKEA=
 github.com/invopop/gobl.br.nfse v0.0.1/go.mod h1:m22voo72ZScRiwIS49wXhzGRahzBO+IEAN0M0Kij3QI=
+github.com/invopop/gobl.cii v0.39.0 h1:1fT1xvUisSPXwi5wdBVSEwpJo4wgix6ADJ0jXhQpc2Q=
+github.com/invopop/gobl.cii v0.39.0/go.mod h1:/uL78fZ5KjE3DcSFsmvNb+mZ6i0m8U1b2Rx14d+AXbc=
 github.com/invopop/gobl.fr.ctc v0.0.4 h1:x4eJ3hp9Y9lTCzWFhNqZYm9kCXyuC34EytOuaU03faE=
 github.com/invopop/gobl.fr.ctc v0.0.4/go.mod h1:YXJ0G7lCWxUehI4C2xBPL1y6rTNC29t/kOul7wY+3Xs=
-github.com/invopop/gobl.mx.cfdi v0.61.0 h1:f/rtRl5mIgePWQxjLB1UfsU45dQp/4/ZxJjsHGGtjiA=
-github.com/invopop/gobl.mx.cfdi v0.61.0/go.mod h1:2ag6z2QhCMltl5YcxL9yL8IzY+mXuOJe39yhk9YWTsM=
-github.com/invopop/gobl.pt.saft v0.0.1 h1:sXG+HsiN8rZVAxSvv33i/5+8QM8UJbadklmZZUkA5dM=
-github.com/invopop/gobl.pt.saft v0.0.1/go.mod h1:0itJS6OpV+2BcaD4xRwEf4gEOcVeGdrfoghwxB+UWrg=
+github.com/invopop/gobl.html v0.101.0 h1:gD+7RsWhwA9avdgsJ21jr99PJXGxKAKAiXriYOaAfY8=
+github.com/invopop/gobl.html v0.101.0/go.mod h1:1OjBWuOZcMlui6ufbdP7yz43LHaithVMgxKAMllgg+M=
+github.com/invopop/gobl.mx.cfdi v0.62.0 h1:Uwh5wbwiTNHJ9fWOK72ma/xVoJMdPvdMf3VI57PjKRw=
+github.com/invopop/gobl.mx.cfdi v0.62.0/go.mod h1:sXy7JIXauSKRqT0HgHsFICIV9YXuSHK3Quq9uZWZ9L0=
+github.com/invopop/gobl.pt.saft v0.0.5 h1:Hc2Sbd280fDgPi9FznI/Xi95lAMzG8A4YEp6SW4H6uY=
+github.com/invopop/gobl.pt.saft v0.0.5/go.mod h1:z5L+dLFBx6PmEdacnFWehYWgiYZSM2HaPzx6ld+DnQs=
 github.com/invopop/gobl.sa.zatca v0.0.2 h1:qU2Y0LP+4mjvZkuG1TOUp/Zs0XxRAzkzQFHy3WOVFEU=
 github.com/invopop/gobl.sa.zatca v0.0.2/go.mod h1:tmLCoaKb4X7sZ2zRU8LalA1sgxM2kQv/uqMzZslhE6A=
+github.com/invopop/gobl.ubl v0.56.0 h1:v3nF0HAysOLCDnDMcTS3qnZCFdibeWq4cpZEZZ5+WAs=
+github.com/invopop/gobl.ubl v0.56.0/go.mod h1:R6+ENuOExqbwayTHblx+xwZg2gnjHpLiIytX5BIvW2o=
 github.com/invopop/icons v0.14.0 h1:Bk0hF+EI/x3XwWX1IqMeFDMdu766zY3zFBqTkImCdhU=
 github.com/invopop/icons v0.14.0/go.mod h1:rXrrY2Rz7Z7KINyQIPMaauqXTZNhVMDI2MYIiux436Y=
 github.com/invopop/jsonschema v0.14.0 h1:MHQqLhvpNUZfw+hM3AZDYK7jxO8FZoQeQM77g8iyZjg=
 github.com/invopop/jsonschema v0.14.0/go.mod h1:ygm6C2EaVNMBDPpaPlnOA2pFAxBnxGjFlMZABxm9n2I=
+github.com/invopop/phive v0.6.0 h1:wtk5+ieD/muViF6SJXGGVA/vYPzed9NoaCl63TjmWU4=
+github.com/invopop/phive v0.6.0/go.mod h1:2Njf8Ci6tjfZkvq7VfdX5Esjx4Q3lzETciSFZ2afKFA=
 github.com/invopop/popui.go v0.30.0 h1:Yx91iSDm7HW2xvGUQCdrRm+HmK1RuA7jxn26+EDbCTg=
 github.com/invopop/popui.go v0.30.0/go.mod h1:2YoksZOz2hkSuSF+F2FUJVlnviPlAwmvu/UpD2hJww8=
+github.com/invopop/validation v0.8.0 h1:e5hXHGnONHImgJdonIpNbctg1hlWy1ncaHoVIQ0JWuw=
+github.com/invopop/validation v0.8.0/go.mod h1:nLLeXYPGwUNfdCdJo7/q3yaHO62LSx/3ri7JvgKR9vg=
+github.com/invopop/xmlctx v0.13.0 h1:ZNRMC0O/A5h8InoLVSA7tIjjrhJn/NDBYfByBUpSb+g=
+github.com/invopop/xmlctx v0.13.0/go.mod h1:xZ3Bdf0jq2GcjN6QNroUa+l37kyXDXmDEEKiBj9NAl0=
+github.com/invopop/xmldsig v0.14.0 h1:ROwf32DZtX2EekrrOSjLLiY0s2kPEcqHZculITlZfAw=
+github.com/invopop/xmldsig v0.14.0/go.mod h1:oWDotOqdKbbwmfA1B057TVsNZW/V1XgoXsRgrW5by18=
 github.com/invopop/yaml v0.3.1 h1:f0+ZpmhfBSS4MhG+4HYseMdJhoeeopbSKbq5Rpeelso=
 github.com/invopop/yaml v0.3.1/go.mod h1:PMOp3nn4/12yEZUFfmOuNHJsZToEEOwoWsT+D81KkeA=
+github.com/jonboulle/clockwork v0.5.0 h1:Hyh9A8u51kptdkR+cqRpT1EebBwTn1oK9YfGYbdFz6I=
+github.com/jonboulle/clockwork v0.5.0/go.mod h1:3mZlmanh0g2NDKO5TWZVJAfofYk64M7XN3SzBPjZF60=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -73,12 +93,16 @@ github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWE
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/pb33f/ordered-map/v2 v2.3.1 h1:5319HDO0aw4DA4gzi+zv4FXU9UlSs3xGZ40wcP1nBjY=
 github.com/pb33f/ordered-map/v2 v2.3.1/go.mod h1:qxFQgd0PkVUtOMCkTapqotNgzRhMPL7VvaHKbd1HnmQ=
+github.com/piglig/go-qr v0.2.4 h1:G/fY3/Oq0NI1oc0lEhBv75QXUtIW/FmcL9l8D1jIo1M=
+github.com/piglig/go-qr v0.2.4/go.mod h1:funyXL4IdgMPcbICoVm1XweMtZy7Px3kyITTENkmA5w=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/rogpeppe/go-internal v1.14.1 h1:UQB4HGPB6osV0SQTLymcB4TgvyWu6ZyliaW0tI/otEQ=
 github.com/rogpeppe/go-internal v1.14.1/go.mod h1:MaRKkUm5W0goXpeCfT7UZI6fk/L7L7so1lCWt35ZSgc=
+github.com/russellhaering/goxmldsig v1.6.0 h1:8fdWXEPh2k/NZNQBPFNoVfS3JmzS4ZprY/sAOpKQLks=
+github.com/russellhaering/goxmldsig v1.6.0/go.mod h1:TrnaquDcYxWXfJrOjeMBTX4mLBeYAqaHEyUeWPxZlBM=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/spf13/cast v1.7.1 h1:cuNEagBQEHWN1FnbGEjCXL2szYEXqfJPbP2HNUaca9Y=
 github.com/spf13/cast v1.7.1/go.mod h1:ancEpBxwJDODSW/UG4rDrAqiKolqNNh2DX3mk86cAdo=
@@ -94,8 +118,12 @@ github.com/valyala/fasttemplate v1.2.2 h1:lxLXG0uE3Qnshl9QyaK6XJxMXlQZELvChBOCmQ
 github.com/valyala/fasttemplate v1.2.2/go.mod h1:KHLXt3tVN2HBp8eijSv/kGJopbvo7S+qRAEEKiv+SiQ=
 github.com/yosida95/uritemplate/v3 v3.0.2 h1:Ed3Oyj9yrmi9087+NczuL5BwkIc4wvTb5zIM+UJPGz4=
 github.com/yosida95/uritemplate/v3 v3.0.2/go.mod h1:ILOh0sOhIJR3+L/8afwt/kE++YT040gmv5BQTMR2HP4=
-gitlab.com/flimzy/testy v0.14.0 h1:2nZV4Wa1OSJb3rOKHh0GJqvvhtE03zT+sKnPCI0owfQ=
-gitlab.com/flimzy/testy v0.14.0/go.mod h1:m3aGuwdXc+N3QgnH+2Ar2zf1yg0UxNdIaXKvC5SlfMk=
+github.com/yosssi/gohtml v0.0.0-20201013000340-ee4748c638f4 h1:0sw0nJM544SpsihWx1bkXdYLQDlzRflMgFJQ4Yih9ts=
+github.com/yosssi/gohtml v0.0.0-20201013000340-ee4748c638f4/go.mod h1:+ccdNT0xMY1dtc5XBxumbYfOUhmduiGudqaDgD2rVRE=
+github.com/yuin/goldmark v1.4.13 h1:fVcFKWvrslecOb/tg+Cc05dkeYx540o0FuFt3nUVDoE=
+github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+gitlab.com/flimzy/testy v0.15.0 h1:69TL12IpxqGUyL8NuRV3Z5OhIDszXLNqLtfBDhOV3ys=
+gitlab.com/flimzy/testy v0.15.0/go.mod h1:KbAJWCwB++0hEFzeeQRbC7vdZYP/yEha94s4X1wVFrw=
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 golang.org/x/crypto v0.53.0 h1:QZ4Muo8THX6CizN2vPPd5fBGHyogrdK9fG4wLPFUsto=
@@ -107,8 +135,17 @@ golang.org/x/sys v0.46.0 h1:noSf2Fq6F8DBgS+LysIkx7rIExoNHJsxOAtPp4rthXw=
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 golang.org/x/text v0.38.0/go.mod h1:YXZt3QhHUKYT53r2lLKFIVi6Ao1jdzrTR/KQ09qyxF4=
+google.golang.org/genproto v0.0.0-20250303144028-a0af3efb3deb h1:ITgPrl429bc6+2ZraNSzMDk3I95nmQln2fuPstKwFDE=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 h1:gRkg/vSppuSQoDjxyiGfN4Upv/h/DQmIR10ZU8dh4Ww=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
+google.golang.org/grpc v1.79.3 h1:sybAEdRIEtvcD68Gx7dmnwjZKlyfuc61Dyo9pGXXkKE=
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 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
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+software.sslmate.com/src/go-pkcs12 v0.7.0 h1:Db8W44cB54TWD7stUFFSWxdfpdn6fZVcDl0w3R4RVM0=
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