Specification Pattern in a separate Project?

I'm planning to use "Specification pattern" to validate my domain objects in my solution.

Where is the "correct" place to put the "specification" classes in my solution? Should I create a 开发者_如何学Godedicated project that contains the "specification" classes, or should I chuck them into Domain or Business project layer?

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Wherever you feel is the right place to achieve functional cohesiveness i.e. keep functionally related artifacts together so they change together, change is localized, easy to find stuff