Agreed, improve the descriptions of artifact repository and artifact terminology services: An artifact repository is a FHIR server that contains canonical resources such as profiles, extensions, libraries, measures, and other knowledge artifacts. An artifact repository may be simply a distribution service, or it may provide more extensive support for authoring services such as dependency tracing and packaging capabilities. An artifact terminology service is a FHIR terminology service with specific capabilities to enable management of versioning issues for collections of knowledge artifacts. Note that although these capabilities are described separately, they may be provided by a single FHIR server playing multiple roles.