Rdb2RdfXG/StateOfTheArt/Table

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Approach Task Ontology exists? Query, Dump Usability OWL Schema Schema/Data Separation
CODE (Man Li) conversion ad-hoc creation dump/batch, ?with possibility to update instance data? semi-automatic, but clear engineering process automatic learning of some hierarchy, domain/range of roles, object properties, 11 rules yes, separate, data is imported after schema creation
D2RQ uni-directional, SPARQL, LinkedData ad-hoc creation query, dump possible automatic mapping automatic mapping generates poor schema, one table per class, only datatype properties, more possible no, everything created at once
DartGrid integration of several DBs integration ontology mandatory query
DB2OWL several DBs, aims at integration distinction between a global ontology and local ontologies, existence of a global target ontology mandatory query, uses R2O automatic basically same as CODE (Man Li), similar rules yes
Habegger learning of a mapping no n.a. proposal of a learning algorithm, no evaluation some hierarchy based on theta subsumption in horn clauses, object properties  ??
OntER(Trinkunas) verify acquisition no manual acquisition of the ontology based on ER model manual, but with clear directives, ?could be automated? conversion of ER model, similarity to RDF is exploited no, but a verification method seems to exist, to validate the handcrafted model against the DB, based on a DB integration tool
OpenLink Virtuoso RDF Views uni-directional, SPARQL, LinkedData, simultaneously access multiple remote or local DBs via SPARQL ad hoc creation query, dump possible Mapping freely specifiable. Embedded SQL/SPARQL conditions for arbitrary mappings. Mapping stored in database as with SQL Views.
Protege DataGenie
Protege DataMaster
Protege OntoBase
R2O+ODEMapster
Relational.OWL
SPASQL
SquirrelRDF uni-directional, access several DBs via SPARQL Config is (augmented) rdfs query, allows SPARQL automatic mapping no, on purpose not no
Triplify uni-directional, LinkedData ad-hoc creation display of LinkedData manual SQL queries supports classes and object properties, early version no, everything created at once