Bridge to relational databases

• Most of the data on the Web are stored in relational databases

• • “RDFying” them is an impossible
  • relational databases are here to stay…

• “Bridges” are being defined:

• • a layer between RDF and the relational data
  • • RDB tables are “mapped” to RDF graphs, possibly on the fly
    • different mapping languages/approaches are being used
  • a number of systems can now be used as relational database as well as triple stores (eg, Oracle, OpenLink, …)

• Work for a survey on mapping techniques benchmarks may start soon at W3C

• SPARQL is becoming the tool of choice to query the data

• • ie, “SPARQL endpoints” are defined to query the databases