2761857b0d
- Implemented `owl_to_mermaid.py` to convert OWL/Turtle files into Mermaid class diagrams. - Implemented `owl_to_plantuml.py` to convert OWL/Turtle files into PlantUML class diagrams. - Added two new PlantUML files for custodian multi-aspect diagrams.
165 lines
5.1 KiB
Markdown
165 lines
5.1 KiB
Markdown
# Step 1 Complete: Oxigraph Setup ✅
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## Summary
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Successfully set up Oxigraph triplestore in-memory mode with sample data and created SPARQL HTTP client.
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## Completed Tasks
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### 1.1 Oxigraph Installation ✅
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- [x] Downloaded Oxigraph v0.5.2 binary
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- [x] Installed to `~/.local/bin/oxigraph_server`
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- [x] Created installation script: `scripts/install-oxigraph.sh`
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### 1.2 Server Scripts ✅
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- [x] `scripts/start-oxigraph-memory.sh` - Start in-memory server (no persistence)
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- [x] `scripts/load-sample-data.sh` - Load N-Triples data into default graph
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- [x] `scripts/load-and-start.sh` - Combined startup + data loading
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**Key Learning**: Use **PUT to `/store?default`** to load data into default graph (not POST)
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### 1.3 Sample RDF Data ✅
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- [x] Created `data/sample-rdf/dutch-heritage-institutions.nt` (78 triples)
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- [x] 6 Dutch heritage institutions:
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- Amsterdam Museum
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- Rijksmuseum
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- Koninklijke Bibliotheek (National Library)
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- Stadsarchief Amsterdam (City Archives)
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- Van Gogh Museum
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- Mauritshuis
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- [x] Schema.org vocabulary
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- [x] Multilingual labels (English + Dutch)
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- [x] Wikidata links via `owl:sameAs`
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### 1.4 SPARQL HTTP Client ✅
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- [x] Created `src/lib/sparql/client.ts` (200 lines)
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- `SparqlClient` class with methods:
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- `executeSelect()` - SELECT queries
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- `executeAsk()` - ASK queries
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- `executeConstruct()` - CONSTRUCT/DESCRIBE queries
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- `testConnection()` - Health check
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- `getTripleCount()` - Database statistics
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- `SparqlError` exception class
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- Environment configuration via `VITE_SPARQL_ENDPOINT`
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- Timeout support (default 30s)
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- AbortController for cancellation
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- [x] Created `tests/unit/sparql-client.test.ts` (20 tests passing, 1 skipped)
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- Constructor tests (4)
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- `executeSelect` tests (5)
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- `executeAsk` tests (2)
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- `executeConstruct` tests (1)
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- `testConnection` tests (2)
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- `getTripleCount` tests (2)
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- Error handling tests (2)
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- Configuration tests (2)
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### 1.5 Environment Configuration ✅
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- [x] Created `.env.local`:
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```
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VITE_SPARQL_ENDPOINT=http://localhost:7878/query
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```
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## Technical Notes
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### Oxigraph ARM Issue (Documented)
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- Persistent storage crashes on macOS ARM (RocksDB bug)
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- **Solution**: Use in-memory mode for development
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- Trade-off: Data reloads on restart (~1 second)
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- Alternative: Docker container (Linux environment)
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### Data Loading Method
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```bash
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# WRONG (creates named graph)
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curl -X POST -H 'Content-Type: application/n-triples' \
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--data-binary '@data.nt' http://localhost:7878/store
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# CORRECT (loads into default graph)
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curl -X PUT -H 'Content-Type: application/n-triples' \
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--data-binary '@data.nt' http://localhost:7878/store?default
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```
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### SPARQL Endpoint URLs
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- **Query endpoint**: `http://localhost:7878/query` (SELECT, ASK, CONSTRUCT, DESCRIBE)
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- **Store endpoint**: `http://localhost:7878/store` (data loading)
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- **Health check**: `http://localhost:7878/` (returns 200)
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## Test Results
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**Before**: 148 tests passing
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**After**: 168 tests passing (+20)
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**Status**: ✅ All passing (1 skipped)
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## Files Created/Modified
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```
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frontend/
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├── .env.local ✅ Created
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├── scripts/
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│ ├── install-oxigraph.sh ✅ Created
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│ ├── start-oxigraph-memory.sh ✅ Created
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│ ├── load-sample-data.sh ✅ Modified (PUT method)
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│ └── load-and-start.sh ✅ Created
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├── data/
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│ └── sample-rdf/
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│ └── dutch-heritage-institutions.nt ✅ Created (comments removed)
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├── src/lib/sparql/
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│ └── client.ts ✅ Created (200 lines)
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├── tests/unit/
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│ └── sparql-client.test.ts ✅ Created (21 tests)
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├── OXIGRAPH_STATUS.md 📝 Reference doc
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└── PHASE3_TASK7_PLAN.md 📝 Plan doc
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```
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## Verification
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### Server Status
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```bash
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$ curl -s http://localhost:7878/ && echo "✅ Server running"
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```
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### Data Verification
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```bash
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$ curl -X POST \
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-H 'Content-Type: application/sparql-query' \
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-H 'Accept: application/sparql-results+json' \
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--data 'SELECT (COUNT(*) as ?count) WHERE { ?s ?p ?o }' \
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http://localhost:7878/query | jq '.results.bindings[0].count.value'
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# Expected output: "78"
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```
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### Query Example
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```bash
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$ curl -X POST \
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-H 'Content-Type: application/sparql-query' \
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-H 'Accept: application/sparql-results+json' \
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--data 'SELECT ?museum ?name WHERE {
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?museum a <http://schema.org/Museum> ;
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<http://schema.org/name> ?name
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} LIMIT 5' \
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http://localhost:7878/query | jq
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```
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## Next Steps
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✅ **Step 1 Complete** - Oxigraph + SPARQL Client
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⏳ **Step 2 Next** - Results Table Component (2.5 hours)
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Continue with:
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1. Create `src/components/query/ResultsTable.tsx`
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2. Create `src/components/query/ResultsTable.css`
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3. Features:
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- Display SPARQL SELECT results in table
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- Column sorting
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- Pagination (100 rows/page)
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- URI rendering (clickable links)
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- Cell type styling (URI, literal, bnode)
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4. Tests: `tests/unit/results-table.test.tsx` (~12-15 tests)
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---
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**Status**: ✅ **COMPLETE**
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**Duration**: ~1.5 hours (as estimated)
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**Test Coverage**: +20 tests (168 total)
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**Lines of Code**: ~400 (client + tests)
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