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OntoDB

A database management system for ontologies: RDF storage, SPARQL queries over B+ tree indexes with a cost-based optimizer, strict two-phase locking, and ARIES crash recovery.

• Code: lamng3/OntoDB
• Manual: https://lamng3.com/ontodb/ (source: lamng3/ontodb-docs)
• Book and papers: in ontodb-docs

Design notes

• Architecture — one query and one committed statement, followed through the code.
• Semantic-Search — what a sorted index can and cannot say about meaning; a class hierarchy as range scans; vector indexes beside the B+ trees.
• Web-Build — compiling the engine to WebAssembly for the playground.
• Roadmap — the feature list and what is built.

Code paths such as src/ and benchmarks/ refer to the OntoDB code repository.