OCL is proposed as a query language within the QVT framework. The main QVT submission bases the specification of transformations on the concept of relations. Relations are not first class entities within the OCL. By extending OCL with the concept of Relations it can better serve the needs of the QVT framework. In particular this enables OCL to be used as a semantic interpretation of a QVT transformation language and may even facilitate the use of OCL as a transformation specification language
