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How to write a OCL constraint to check if a particular Key-Value pair is always present in a HashTable using iterate feature in OCL? I am a beginner in OCL. Any hints or example would be helpful.

user1771165
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Take a look at the Unique operator for collections. It may be a simpler way to achieve what you want.

Jordi Cabot
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  • If you are interested in describing such constraint with `iterate`, the OCL specification already includes formal definitions for the collection operations. – Javier Mar 07 '14 at 05:51