Date Added: May 2009
The semantic web is the extension of WWW whose purpose is to allow software agents to process documents more intelligently. Access to RDF data is one of the key moments for semantic applications and requires implementing both retrieval and reasoning. Reasoning with large ontologies and data sets becomes increasingly important. It is a serious challenge for the most advanced in-memory reasoners, and they begin to exploit databases. Most of the proposals apply a hybrid database/reasoner architecture which has several shortcomings.