<xs:group name="GroupingNodeContentModel">
    <xs:choice>
        <xs:element ref="Anchor" />
        <xs:element ref="Billboard" />
        <xs:element ref="Collision" />
        <xs:element ref="Group" />
        <xs:element ref="LOD" />
        <xs:element ref="StaticGroup" />
        <xs:element ref="Switch" />
        <xs:element ref="Transform" />
        <xs:element ref="EspduTransform" />
        <xs:element ref="ReceiverPdu" />
        <xs:element ref="SignalPdu" />
        <xs:element ref="TransmitterPdu" />
        <xs:element ref="GeoLocation" />
        <xs:element ref="GeoLOD" />
        <!-- TODO where is GeoTransform in spec?
							<xs:element ref="GeoTransform"/> -->
        <xs:element ref="HAnimJoint" />
        <xs:element ref="NurbsSet" />
        <xs:element ref="CADAssembly" />
        <xs:element ref="CADLayer" />
        <xs:element ref="CADPart" />
        <xs:element ref="Viewport" />
        <xs:element ref="LayoutGroup" />
        <xs:element ref="ScreenGroup" />
    </xs:choice>
</xs:group>