The necessity of shifting data organization and storage from
RDBMS into Semantic Web compliant data structures has led W3C,
the main standardization body on Web Technologies, to launch a
special Incubator Group2 with a two-fold mission: (a) to examine
and classify existing approaches to mapping relational data into
RDF and decide whether standardization is possible and/or necessary
in this area and, if so, the direction such standardization
could take, and (b) to examine and classify existing approaches to
mapping OWL classes to relational data or, more accurately, SQL
queries, moving towards the goal of defining a standard in this