DIG 2.0 Reference Middleware Timo Weith¨oner 1 Thorsten Liebig 1 Marko Luther 0 Sebastian B¨ohm 0 DoCoMo Euro-Labs , Munich , Germany Inst. of Artificial Intelligence, Ulm University , Ulm , Germany

The DIG protocol [1] - the de-facto standard for the communication between DL reasoners and their clients - is currently being updated to a new version. DIG 2.0 [2] will reflect the upcoming OWL 1.1 and add previously missing functionality such as axiom retraction and told axiom access. In addition the new standard is extensible, which allows to add new requests and responses to the protocol. As a consequence, installations might get more complex and might even face the challenge of integrating systems implementing different DIG versions.

 1. Bechhofer , S., M¨oller , R., Crowther , P. : The DIG Description Logic Interface . In Calvanese, D.e.a., ed. : Proc. of the Int. Workshop on Description Logics (DL'03) . Volume 81 of CEUR., Rome, Italy ( 2003 ) 2. Turhan , A.Y. , Bechhofer , S. , Kaplunova , A. , Liebig , T. , Luther , M. , Noppens , O. , Patel-Schneider , P. , Suntisrivaraporn , B. , Weith¨oner, T.: DIG 2 . 0 - Towards a Flexible Interface for Description Logic Reasoners . In: Proc. of the OWL Experiences and Directions Workshop (OWLED'06) at the ISWC'06 , Athens, Georgia, USA ( 2006 )