# Task 2b – DrawIO Parser Metadata Integration (2025-02-14)

## Summary
- Implemented a `DrawioParserGraph` subclass that records `csv_path` metadata while leveraging rdflib's namespace manager for prefix bindings.
- Added XML metadata extraction that captures CSV paths, base URIs, and user-defined prefix mappings injected by the DrawIO UI.
- Sanitised metadata-patched DrawIO documents by replacing the root `<UserObject>` wrapper with the expected `<mxCell id="0" />` node prior to structural parsing.
- Refactored CLI and library entry points to funnel parsing through a shared `_build_graph_from_raw_xml` helper that returns fully initialised `DrawioParserGraph` instances.
- Extended pytest coverage to assert metadata exposure, namespace registration, and backward compatibility for legacy fixtures.
- Added regression coverage that patches every pristine DrawIO fixture with metadata on-the-fly via `patchDrawioWithMetadata.ts`, verifying graph isomorphism and metadata propagation.

## Testing
- `pip install rdflib`
- `pytest src/main/webapp/plugins/rdfexport/legacy/tests/test_patched_parser.py`
- `bun run test`

## Notes
- The metadata sanitisation step preserves backwards compatibility by leaving pristine fixtures untouched while supporting metadata-augmented documents generated by `patchDrawioWithMetadata.ts` and the DrawIO UI.
- Namespace bindings now replace existing entries to ensure user-provided prefixes override defaults where necessary. Base URIs are bound as the default namespace and stored on the graph's `base` attribute.