Note that all schema supplied by the UPnP Forum AV WC committee are for informational use only and that the standardized DCPs describe the normative requirements for these schema. Some schema provided do not necessarily embody requirements regarding number of element occurrances allowed or their ordering. Schema for stateVariableValuePairs in UPnP A/V Schema for UPnP A/V ContentDirectory Service FeatureList The existence of a Feature element indicates support for the feature whose name and version are given by the values of the 'name' and 'version' attributes, respectively. All AV Working Committee defined Feature elements MUST contain one or more occurrences of the element 'objectIDs', optionally followed by any vendor-defined elements. Allowed under an EPG, Tuner, or Bookmark feature. Allowed under an “ForeignMetadata" feature. Allowed under an “FFQ" feature. All AV Working Committee defined Feature elements MAY contain one or more occurrences of the element 'objectIDs', optionally followed by any vendor-defined elements. Foreign Metadata 'type' element Free-Form Query 'objectID' element Currently the content of a Feature element may include zero or more of the occurrences of the element 'objectIDs' and/or any vendor-defined element. The existence of a namespaceList element indicates support for searches using FreeFormQuery on the properties belonging to those namespaces. The existence of a propertyList element indicates support for searches using FreeFormQuery on the properties in the list.