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Domian is a Java implementation of the Evans/Fowler Specifications pattern.

http://www.martinfowler.com/apsupp/spec.pdf

Specifications are prototype-like objects for powerfully expressing state and behaviour of objects. Typical examples of usage are object selection/projection, object validation, and object creation.

http://domian.sourceforge.net/introduction.html

With the v0.3 release, the implementation of the original Specifications Pattern is completed.
Both specification satisfaction, subsumption, and partial satisfaction are now supported.