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SparQL

In order to support chaining of non-materialized views, we prefer our ontology view definition language (VDL) to be the same language as our query language (closure property). As such, we began by looking at query languages over RDF (or RDFS or the various forms of OWL). Although we read about several such languages (including RQL, RDQL, SeRQL, Triple, Versa, RVL, etc.), we decided to focus our initial attention on SparQL as it has W3C candidate recommendation. SparQL already had a lot of traction in the Semantic Web community as well as several engine implementations. We thought it prudent to look first to the standards (or closest things to a standard) and see if these were sufficient for our needs or could be extended to meet our needs.

Investigation Logs

• SparQL and the closure property​
• SparQL web services for the FMA​ (and a few view composition slides)
• View query composition work
  • Querying Non-Materialized Ontology Views : AMIA2007 poster abstract​
  • Querying Non-Materialized Ontology Views : AMIA2007 poster​
  • TODO: add view composition slides from Stanford presentation
• Querying pre-materialized transitive closure relationships​
• Initial investigation into ARQ property functions​
• Further investigation into ARQ property functions (regular paths)