<ShellSet n="" xmlns="http://qifstandards.org/xsd/qif3">
  <Shell closed="0" color="" form="UNKNOWN" hidden="0" id="" label="" size="" transparency="0.0" turned="0">{1,unbounded}</Shell>
</ShellSet>

<xs:element name="ShellSet" type="ShellSetType">
  <xs:annotation>
    <xs:documentation>The ShellSet element gives the set of boundary representation shells that define the working volume.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:complexType name="ClosedShellSetType">
  <xs:annotation>
    <xs:documentation>The ClosedShellSetType defines a set of closed outer shells, including the geometry and topology of the components of the shells.</xs:documentation>
  </xs:annotation>
  <xs:sequence>
    <xs:element ref="PointSet" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional PointSet element is a collection of all instances of PointEntityType present in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="Curve12Set" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional Curve12Set element is a collection of all 2D curves (curve(t):R1->R2) present in the shell set. These curves are defined in the parametric space of a surface.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="Curve13Set" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional Curve13Set element is a collection of all 3D curves (curve(t):R1->R3) present in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="SurfaceSet" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional SurfaceSet element is a collection of all surfaces present in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="CurveMeshSet" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional CurveMeshSet element is a collection of all mesh curves present in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="SurfaceMeshSet" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional SurfaceMeshSet element is a collection of all mesh surfaces present in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="VertexSet" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional VertexSet element is a collection of all vertices used in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="EdgeSet" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional EdgeSet element is a collection of all edges used in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="LoopSet" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional LoopSet element is a collection of all loops used in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element ref="FaceSet" minOccurs="0">
      <xs:annotation>
        <xs:documentation>The optional FaceSet element is a collection of all faces used in the shell set.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element name="ShellSet" type="ShellSetType">
      <xs:annotation>
        <xs:documentation>The ShellSet element gives the set of boundary representation shells that define the working volume.</xs:documentation>
      </xs:annotation>
    </xs:element>
  </xs:sequence>
</xs:complexType>