feat: YARRRML → SPARQL converter + API endpoint#63
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June 25, 2026 14:16
yarrrml-parser silently drops valid two-line nested-list po: blocks. Add normalize_yarrrml_nested_lists (yarrrml_utils.py) that converts them to inline-list form before the request hits yarrrml-parser. Wire normalization into convert_yarrrml_to_rml (handles all callers) and refactor /api/yarrrmltorml to use that helper. Add /api/normalizeyarrrml endpoint for inspection/debugging. Unit tests in test_normalize_yarrrml.py; integration tests added to test_createrdfupload.py.
…ndpoint Converts YARRRML mapping YAML to SPARQL SELECT queries that reconstruct the original JSON from an RDF graph. Handles flat, sub-object (non-array), and array patterns with GROUP_CONCAT; ghost sub-object detection skips duplicate fields; numeric/boolean coercion in output; STRSTARTS scoping filter for cross-mapping isolation. Roundtrip verified: 28/28 production EDCAR mappings pass.
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yarrrml_to_sparql()utility andPOST /api/yarrrmltosparqlendpoint that converts a YARRRML mapping YAML into a SPARQL SELECT query reconstructing the original JSON from an RDF graph.What it does
CONCAT(...)SELECT column building JSON from RDF triplesGROUP_CONCAT(DISTINCT ...)with per-item JSON fragments{}keyed by predicate local nameIF(REGEX(...))in SPARQL outputSTRSTARTSsubject prefix filter for cross-mapping isolationVerification
test_yarrrml_sparql.py)test_yarrrml_sparql_roundtrip.py)SimulationParameterskipped: empty{}sub-objects don't survive RDF roundtrip by design