Associative engine

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An associative engine (AE) in CAD/solid modelling software is the component which maintains the associative relationships between the collection of geometric entities. The associative relationships are basically LISP expressions which describe the orientation and placement of two or more geometric entities in relationship to each other. The AE will force a regeneration through the use of transmigration operations if a user changes any of the associations used to make up the final change state.

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