<group name="Value">
    <annotation>
        <documentation>Utility choice group which unifies generic Values defined in this schema document with 

			Geometry and Temporal objects and the Measures described above, 

			so that any of these may be used within aggregate Values.</documentation>
    </annotation>
    <choice>
        <!-- <element ref="gml:_Value"/> -->
        <group ref="gml:ValueObject" />
        <element ref="gml:_Object" />
        <!--			<element ref="gml:_Geometry"/>

			<element ref="gml:_TimeObject"/> -->
        <element ref="gml:Null" />
    </choice>
</group>