Query
allow programs to retrieve information from DAML knowledge bases
analogous to SQL queries of databases
there is an emerging hierarchy of query languages corresponding to language layers
DAML+OIL
+ entailment
DQL
RDFS
+ subclasses/subproperties
RQL
,
Sesame
,
DSSS
RDF
direct statement match
RDF DB
,
Squish
, Jena
RDQL
Semantic Web queries of existing databases should be possible with bidirectional mapping
Mike Dean
47 of 59