| Large ABox Store (LAS) extends the DL reasoner Racer with a database. LAS stores the given information about a TBox, a taxonomy, and ABox in a database, and answers most TBox and ABox queries by combining SQL queries with DL reasoning. The main feature of our system is that it can deal with ABox role assertions. Acting as a filter for Racer, LAS speeds up the TBox and ABox queries. The main techniques exploited in LAS are the pseudo model merging test technique, and the transitive closure algorithm implemented by Oracle 9i.; This thesis presents the design, theories and implementation of the LAS system, and it mainly addresses the database support for TBox queries in LAS. A user-friendly interface is designed to facilitate users to implement many kinds of queries. More complex querying functions can be integrated into this system in the future. |
