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. Retrieve a change set as an iterable resource - a handy function for viewing large change sets Return a <i>DirectoryURI</i> that represents the subset of the associations in <i>directory</i> whose target matches the supplied expression. Return an <i>EntityDirectoryURI</i> that references only the EntityReferences in <i>directory</i> that have assertions about the (EntityDescriptions) in the named code system version. Return the number of elements currently represented by the supplied directory URI. Resolve a <i>DirectoryURI </i> that references a set of code system catalog entries and return the set of corresponding catalog entries return a DirectoryURI that resolves to the set of entities that occur in the <i>source</i> position of the resolution of the supplied association directory return a DirectoryURI that resolves to the set of entities that occur in the <i>target</i> position or as the target of a BNODE in the resolution of the supplied association directory Return a <i>DirectoryURI </i>that represents the subset of the associations in <i>directory</i> whose subject is <i>sourceEntity.</i> Return a <i>DirectoryURI </i>that represents the subset of the associations in <i>directory</i> whose predicate is <i>predicate.</i> return a DirectoryURI that resolves to the set of entities that occur in either the <i>source</i> or the <i>target </i>position of the resolution of the supplied association directory Return a <i>DirectoryURI</i> that represents the subset of the associations having either a <i>source</i> or a <i>target</i> matching the supplied entity. This is equivalent to the union of <i>restrictToSourceEntity </i>and <i>restrictToTargetEntity</i> with <i>source</i> and <i>target</i> being the same 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> Return a <i>DirectoryURI</i> that represents the subset of the associations in <i>directory</i> having a string literal that matches <i>target</i>. return a DirectoryURI that resolves to the set of entities that occur in the <i>predicate</i> position of the resolution of the supplied association directory Return a <i>DirectoryURI </i>that represents the subset of the associations in <i>directory</i> having a target directly matching <i>target</i> or containing one or more bnodes who reference <i>target</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. the name and URI of a code system that is known to this service the name and URI of the code system version that are recognized by this service A <i>DirectoryURI </i>that resolves to all <i>Associations</i> known to the service. The set of new assertions that can be inferred from the combination of the assertions in <i>associationList</i> and the set that are <i>assertedBy</i> <i>codeSystemVersion</i>. The referenced <i>CodeSystemVersion</i> is not recognized by the service Inference is not supported for the supplied codeSystemVersion 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. 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 An extension to the <i>AssociationQueryService</i> that allows the posing of "what if" questions.