To enable expressions to be stored and accessed in the terminology server, the expression repository first needs to be created.
A SNOMED CT-enabled expression repository is not a standalone artifact. The expression repository is tightly coupled with the terminology repository in the sense that all expressions represented in the expression repository are composed of concepts included in the applied terminology repository, i.e. a specific version of a SNOMED CT Edition. The terminology content on which the expression repository depends is also referred to as the substrate. When a terminology repository is updated to include a new version of SNOMED CT, the expression repository will equally need to be updated to align with the applied terminology content.
The services required by a terminology server to create an expression repository are described in 5.2.1 Create Expression Repository
The overall requirements for updating an expression repository are described in 5.2.3 Update Expression Repository
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