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The Naomi project develops an OCL 1.5 interpretation and validation framework. Arbitrary model information is accessed via a model interface. The interface is extended to support OCL constraints on MOF compliant metamodels (e.g. UML metamodels).
This is an implementation of the UML's Object Constraint Language.
It's being developed so that it will be able to act as a component in general purpose open source UML modeling tools.