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Problem: Postcoordinated terminologies are too complicated

Useful terminologies risk becoming so complex that nobody can remember all the peculiar rules of how to use it correctly. Even those who devise the rules often fail to apply them consistently.

This burden on both authors and end users can be reduced if, instead of writing the rules in instruction manuals, they are instead encoded primarily as a machine-readable declaration of how the Terminology should be constructed or extended. Such a metamodel may then be used at run time to guide user choices pre hoc towards well formed expressions, or to normalize new candidate expressions post hoc to a preferred semantic form, or to reject expressions that can not be normalized in this way.

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