If the mode identified in the sorting attribute of the query element is property (see sorting), additional information is required by the query.
<query sorting="property" sortProp="type:name:default"The sortProp includes:
type—One of the six valid property types:
enum,string,integer,float,boolean, anddate.Name—A valid property name of the given type.
Default—A valid value for the property of the given type; this value is used for results that do not contain the given property.
