OCLPrime - Environment and Language for Model Query, Views and Transformations

UML, MOF, and MDA currently do not provide a standardized means to describe manipulation of model-elements in algorithms or rules. In order to define specific UML-based methods in a product-independent and portable way, this capability is essential. This paper discusses design and implementation of the hybrid language framework Prime and its derivative language OCLPrime in the light of the OMG Query / Views / Transformations RFP. Prime allows and coordinates the reuse of dierent languages for validation, selection, and projection in the Transformation of models. Its design follows the Composite, Visitor, and Interpreter patterns and coordinates the sub-languages in transactions. OCLPrime is a reference language implementation in Prime employing OCL expressions to select parts of a source model and SQL DML to project these into a target model. Pre- and Post-validations are performed by a UML Profile Validator.