ViewpointGroup

<xs:element name="ViewpointGroup">
  <xs:annotation>
    <xs:appinfo>
      <xs:element name="children" type="MFNode" fixed="inputOutputField" default="X3DViewpointNode|ViewpointGroup"/>
      <xs:attribute name="componentName" type="xs:NMTOKEN" fixed="Navigation"/>
      <xs:attribute name="componentLevel" type="xs:positiveInteger" fixed="3"/>
    </xs:appinfo>
    <xs:documentation source="http://www.web3d.org/documents/specifications/19775-1/V3.3/Part01/components/navigation.html#ViewpointGroup"/>
  </xs:annotation>
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="X3DChildNode">
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element ref="Viewpoint"/>
          <xs:element ref="OrthoViewpoint"/>
          <xs:element ref="GeoViewpoint"/>
          <xs:element ref="ViewpointGroup"/>
          <xs:element ref="ProtoInstance">
            <xs:annotation>
              <xs:documentation>Appropriately typed substitution node</xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:choice>
        <xs:attribute name="center" type="SFVec3f" default="0 0 0"/>
        <xs:attribute name="description" type="SFString"/>
        <xs:attribute name="displayed" type="SFBool" default="true"/>
        <xs:attribute name="retainUserOffsets" type="SFBool" default="false"/>
        <xs:attribute name="size" type="SFVec3f" default="0 0 0"/>
        <xs:attribute name="containerField" type="xs:NMTOKEN" default="children"/>
      </xs:extension>
    </xs:complexContent>
  </xs:complexType>
</xs:element>