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MQL: a powerful extension to OCL for MOF queries

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3 Author(s)
Hearnden, D. ; Sch. of ITEE, Queensland Univ., Brisbane, Qld., Australia ; Raymond, K. ; Steel, J.

The Meta-Object Facility (MOF) provides a standardized framework for object-oriented models. An instance of a MOF model contains objects and links whose interfaces are entirely derived from that model. Information contained in these objects can be accessed directly, however, in order to realize the Model-Driven Architecture@trade; (MDA), we must have a mechanism for representing and evaluating structured queries on these instances. The MOF Query Language (MQL) is a language that extends the UML's Object Constraint Language (OCL) to provide more expressive power, such as higher-order queries, parametric polymorphism and argument polymorphism. Not only do these features allow more powerful queries, but they also encourage a greater degree of modularization and re-use, resulting in faster prototyping and facilitating automated integrity analysis. This paper presents an overview of the motivations for developing MQL and also discusses its abstract syntax, presented as a MOF model, and its semantics.

Published in:

Enterprise Distributed Object Computing Conference, 2003. Proceedings. Seventh IEEE International

Date of Conference:

16-19 Sept. 2003

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