NurbsSweptSurface

<xs:element name="NurbsSweptSurface">
  <xs:annotation>
    <xs:appinfo>
      <xs:element name="crossSectionCurve" type="SFNode" fixed="inputOutputField" default="X3DNurbsControlCurveNode"/>
      <xs:element name="trajectoryCurve" type="SFNode" fixed="inputOutputField" default="NurbsCurve"/>
      <xs:attribute name="componentName" type="xs:NMTOKEN" fixed="NURBS"/>
      <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/nurbs.html#NurbsSweptSurface"/>
  </xs:annotation>
  <xs:complexType>
    <xs:complexContent>
      <xs:extension base="X3DParametricGeometryNode">
        <xs:choice minOccurs="0" maxOccurs="2">
          <xs:element ref="ContourPolyline2D">
            <xs:annotation>
              <xs:documentation>crossSectionCurve</xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element ref="NurbsCurve2D">
            <xs:annotation>
              <xs:documentation>crossSectionCurve</xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element ref="NurbsCurve">
            <xs:annotation>
              <xs:documentation>trajectoryCurve</xs:documentation>
            </xs:annotation>
          </xs:element>
          <xs:element ref="ProtoInstance">
            <xs:annotation>
              <xs:documentation>Appropriately typed substitution node</xs:documentation>
            </xs:annotation>
          </xs:element>
        </xs:choice>
        <xs:attribute name="ccw" type="SFBool" default="true"/>
        <xs:attribute name="solid" type="SFBool" default="true"/>
        <xs:attribute name="containerField" type="xs:NMTOKEN" default="geometry"/>
      </xs:extension>
      <!-- TODO see if nondeterministic content model can avoid improper selection of child nodes -->
    </xs:complexContent>
  </xs:complexType>
</xs:element>