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 match algorithms that can be used in filters for this service instance the set of model attributes that can be referenced in filter instances for the given service implementation The set of properties that are used in one or more instances of the resource represented by this service. This list includes all properties that can be used in queries in this service, independent of the <i>entryState </i>or temporal state of the resource(s) being searched. Return the number of elements currently represented by the supplied directory URI. The supplied <i>directory</i> URI is not valid The type represented by the supplied <i>directory</i> URI is not the one required by the service invocation. 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 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 Restrict the set of referenced definitions to those which reference the named code system.Return an <i>EntityDirectoryURI</i> that references only the EntityReferences in <i>directory</i> that have assertions about the (EntityDescriptions) in the tagged version of the supplied code system. Note that this does not constrain the \\ <i>knownEntityDescription</i> attribute within the <i>EntityReference</i> itself - an <i>EntityReference</i> that has assertions in code system A and B would still have two <i>knownEntityDescription</i> entries even after this restriction is applied. Further constraint can be accomplished via the <i>resolve</i> functions. The referenced <i>CodeSystem</i> is not recognized by the service The supplied <i>directory</i> URI is not valid The type represented by the supplied <i>directory</i> URI is not the one required by the service invocation. Return a <i>DirectoryURI</i> that references the set of all elements represented by <i>directory</i> that match the criteria specified in <i>filter.</i> Remove any of the elements in <i>elementsToRemove</i> from <i>initialSet </i>if present. Elements in <i>elementsToRemove</i> that are not in <i>initialSet</i> are ignored. Return a directory that represents the set of elements that are common to the two supplied directories. Note that both DirectoryURIs must represent resources of the same type. Return a directory that represents the combination of the contents of the supplied two supplied directories, with duplicate entries removed. Note that both of the directory URIs must resolve to entries of the same type.