# Requirements

A terminology server supporting postcoordination should support the general features of a SNOMED CT-enabled terminology server, and additionally, support the features required to manage and use postcoordinated expressions. This involves an expression repository to store the postcoordinated expressions, and a set of services to access, process and query the expressions in the same way as pre-coordinated SNOMED CT content. This section provides an overview of the general requirements of an expression repository and the associated services.

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