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. 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.