Bridge to relational databases

• Huge amount of data are stored in (relational) databases

• • “RDFying” them is impossible

• “Bridges” are being defined:

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

• Work for a survey on mapping techniques has just started at W3C

• SPARQL is becoming the tool of choice to query the data (via SPARQL “endpoints”)