type

<xs:attribute name="type" default="main">
  <xs:annotation>
    <xs:documentation>specifies the role of this subdivision of the title. Suggested values include: 1] main; 2] sub(subordinate) ; 3] alt(alternate) ; 4] short; 5] desc(descriptive)</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:union>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="main">
            <xs:annotation>
              <xs:documentation>main title of the work</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="sub">
            <xs:annotation>
              <xs:documentation>(subordinate) subtitle of the work</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="alt">
            <xs:annotation>
              <xs:documentation