alist of the representation formats supported by the service. Example: text/html, text/xml, application/json the version or release identifier of the service the default format used by the service unless otherwise specified the set of namespaces recognized by this service. Because many namespace identifiers tend to be cryptic (i.e. HL7 OIDs, BioPortal URL's, etc.), <i>knownNamespace</i> includes the namespace name, an optional URI \emph{and} a place to provide textual detail describing what the namespace references. Note that namespace names must be unique across an entire CTS2 implementation - the same namespace name cannot represent one namespace in code system A and a second in code system B. Note also that namespace names are \emph{local} to a service instance. Information that is communicated between service instances, recorded in data tables or client software \emph{must} use full URIs. a reference to the individual or organization that provides the service. the set of service profiles that are supported by this service implementation a description of the service, its use, etc. a short name that identifies the particular service and implementation the particular implementation type(s) supported by this profile The set of version tags known to the service. All services must recognize the "CURRENT" tag, although interpretation is service specific. Return TRUE if the a <i>CodeSystemVersion</i> is known to the service by the supplied name, URI, OID or alternateID. The <i>referenceLanguage</i> is not supported by the service The change set specified could either not be read or located by the service. The <i>changeSetContext</i> is recognized by the service, but its state is not <i>OPEN</i>. One or more <i>changeSetContext</i> is not supported by the service Retrieve the specified code system version details for the specified code system from the service.Retrieve the specified code system version details for the specified code system from the service. The <i>versionTag</i> is not recognized by the service The referenced <i>CodeSystem</i> is not recognized by the service Errors that can occur in sort and/or filter parameters The <i>format</i> is not supported by the service implementation The <i>timeLimit</i> was exceeded by the service. Errors that can occur in sort and/or filter parameters The <i>format</i> is not supported by the service implementation The <i>timeLimit</i> was exceeded by the service. Return the catalog entry by the supplied name, URI, OID or alternateID. The referenced <i>CodeSystem</i> is not recognized by the service The <i>referenceLanguage</i> is not supported by the service The change set specified could either not be read or located by the service. The <i>changeSetContext</i> is recognized by the service, but its state is not <i>OPEN</i>. One or more <i>changeSetContext</i> is not supported by the service Errors that can occur in sort and/or filter parameters The <i>format</i> is not supported by the service implementation The <i>timeLimit</i> was exceeded by the service. Determine if the specified version of the code system exists for the specified code system on the service.Determine if the specified version of the code system exists for the specified code system on the service. The <i>versionTag</i> is not recognized by the service The <i>referenceLanguage</i> is not supported by the service The change set specified could either not be read or located by the service. The <i>changeSetContext</i> is recognized by the service, but its state is not <i>OPEN</i>. One or more <i>changeSetContext</i> is not supported by the service Retrieve the specified version of the code system exists for the specified external identifier. The referenced <i>CodeSystemVersion</i> is not recognized by the service The referenced <i>CodeSystem</i> is not recognized by the service The <i>referenceLanguage</i> is not supported by the service The change set specified could either not be read or located by the service. The <i>changeSetContext</i> is recognized by the service, but its state is not <i>OPEN</i>. One or more <i>changeSetContext</i> is not supported by the service Determine if the specified version of the code system exists for the specified external identifier. The referenced <i>CodeSystem</i> is not recognized by the service The <i>referenceLanguage</i> is not supported by the service The change set specified could either not be read or located by the service. The <i>changeSetContext</i> is recognized by the service, but its state is not <i>OPEN</i>. One or more <i>changeSetContext</i> is not supported by the service A service that provides direct read access to metadata about specific versions of code systems.