RDFa-Editor

A declarative XHTML+RDFa authoring tool running entirely on client-side XSLT 3.0 (SaxonJS 3 with the ixsl: interactive extensions). No JavaScript application code — the editor UI, the editing behavior, the RDFa extraction and the document canonicalization are all XSLT.

• Structured-block editing of any number of .rdfa-editor-content regions (p, h1–h3, lists, blockquote, pre, figure): Enter splits, Backspace merges, toolbar for block types / inline formatting / links / figures, drag-handle and Alt+Arrow reordering, HTML paste through a sanitizing canonicalization pipeline, unified snapshot undo/redo with caret restoration.
• RDFa annotation: right-click a selection to assert a statement (S/P/O framing, vocabulary dropdowns fed by plain ontology RDF/XML files); right-click an annotation to edit or remove it.
• Strictly W3C-conformant RDFa 1.1 extraction to RDF/XML ("Extract RDF"), a canonical serialization stripping all editing ephemera ("Source"), and RDFa lint (unresolvable terms, unsafe markup, step-11 conflicts) surfaced as wavy underlines + a breadcrumb badge.
• Navigation: ToC drawer (outline with section drag-reorder), breadcrumb bar with the RDFa subject in scope at the caret, find & replace.

Run

make up                         # build the SEF, then serve on http://localhost:8000
# open http://localhost:8000/index.html — override the port with: make up PORT=9000

make up runs make sef first (compile src/*.xsl → dist/index.xsl.sef.json, needs xmlstarlet + npx), then serves the repo with python3 -m http.server. Run make sef alone to rebuild the SEF without serving.

Test

make test                       # headless XSLT suites: extractor, canonicalization, lint fixtures
make install                    # install Node dependencies (Playwright) for the browser tests
make test-browser               # Playwright suites (rebuilds the SEF, serves the repo itself)

Architecture

See CLAUDE.md for the module map and conventions. The load-bearing pieces: src/RDFa2RDFXML-v3.xsl (RDFa 1.1 → RDF/XML, pure XSLT, headless-tested), src/canonical-xhtml.xsl (canonical + sanitized serialization form, pure XSLT), src/lint-rdfa.xsl (pure), and the IXSL modules edit.xsl / annotate.xsl / overlay.xsl / navigate.xsl / undo.xsl / vocab.xsl. The editor's stylesheet is self-contained: a host page provides one or more .rdfa-editor-content regions, rdfa-editor.css, and preloads the vocabulary documents into the SaxonJS document pool (see index.html).

Embedding in LinkedDataHub

The plan for replacing LinkedDataHub's WYMEditor with this editor lives in docs/ldh/MIGRATION.md. The overall roadmap is in docs/ROADMAP.md.