<xs:element name="SphericalZone" type="ConcentricitySphericalZoneType">
  <xs:annotation>
    <xs:documentation>The SphericalZone element is present when the concentricity characteristic feature control frame contains a spherical diameter symbol modifying the tolerance value.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="DiametricalZone" type="ConcentricityDiametricalZoneType">
  <xs:annotation>
    <xs:documentation>The DiametricalZone element is present when the concentricity characteristic feature control frame contains a diameter symbol modifying the tolerance value.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:element name="NonDiametricalZone" type="ConcentricityNonDiametricalZoneType">
  <xs:annotation>
    <xs:documentation>The NonDiametricalZone element is present when the concentricity characteristic feature control frame does not contain a diameter symbol modifying the tolerance value.</xs:documentation>
  </xs:annotation>
</xs:element>

<xs:complexType name="ConcentricityZoneShapeType">
  <xs:annotation>
    <xs:documentation>The ConcentricityZoneShapeType defines the shape of the tolerance zone for a concentricity characteristic.</xs:documentation>
  </xs:annotation>
  <xs:choice>
    <xs:annotation>
      <xs:documentation>This compositor provides a choice of the zone shape for a concentricity characteristic. The zone shape is indicated by any symbols preceding the tolerance value in the feature control frame.</xs:documentation>
    </xs:annotation>
    <xs:element name="SphericalZone" type="ConcentricitySphericalZoneType">
      <xs:annotation>
        <xs:documentation>The SphericalZone element is present when the concentricity characteristic feature control frame contains a spherical diameter symbol modifying the tolerance value.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element name="DiametricalZone" type="ConcentricityDiametricalZoneType">
      <xs:annotation>
        <xs:documentation>The DiametricalZone element is present when the concentricity characteristic feature control frame contains a diameter symbol modifying the tolerance value.</xs:documentation>
      </xs:annotation>
    </xs:element>
    <xs:element name="NonDiametricalZone" type="ConcentricityNonDiametricalZoneType">
      <xs:annotation>
        <xs:documentation>The NonDiametricalZone element is present when the concentricity characteristic feature control frame does not contain a diameter symbol modifying the tolerance value.</xs:documentation>
      </xs:annotation>
    </xs:element>
  </xs:choice>
</xs:complexType>