type

<xs:attribute name="type">
  <xs:annotation>
    <xs:documentation>Characterizes the element in some sense, using any convenient classification scheme or typology. Suggested values include: 1] abstract; 2] ack; 3] appendix; 4] bibliography; 5] colophon; 6] contents; 7] dedication; 8] frontispiece; 9] glossary; 10] half-title; 11] index; 12] annotations; 13] preface</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:union memberTypes="xs:NMTOKEN">
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="abstract">
            <xs:annotation>
              <xs:documentation>A summary of the content of a text as continuous prose.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="ack">
            <xs:annotation>
              <xs:documentation>A formal declaration of acknowledgement by the author in which persons and institutions are thanked for their part in the creation of a text.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="appendix">
            <xs:annotation>
              <xs:documentation>An ancillary self-contained section of a work, often providing additional but in some sense extra-canonical text.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="bibliography">
            <xs:annotation>
              <xs:documentation>A list of bibliographic citations.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="colophon">
            <xs:annotation>
              <xs:documentation>A statement appearing at the end of a book describing the conditions of its physical production.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="contents">
            <xs:annotation>
              <xs:documentation>A table of contents, specifying the structure of a work and listing its constituents. The list element should be used to mark its structure.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="dedication">
            <xs:annotation>
              <xs:documentation>A formal offering or dedication of a text to one or more persons or institutions by the author.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="frontispiece">
            <xs:annotation>
              <xs:documentation>A pictorial frontispiece, possibly including some text.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="glossary">
            <xs:annotation>
              <xs:documentation>A list of terms associated with definition texts (‘glosses’).</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="half-title">
            <xs:annotation>
              <xs:documentation>A page containing only the title of a book — as opposed to the title page, which also lists subtitle, author, imprint and similar data.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="index">
            <xs:annotation>
              <xs:documentation>Any form of index to the work.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="annotations">
            <xs:annotation>
              <xs:documentation>A section in which annotations on the text are gathered together.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
      <xs:simpleType>
        <xs:restriction base="xs:token">
          <xs:enumeration value="preface">
            <xs:annotation>
              <xs:documentation>A foreword or preface addressed to the reader in which the author or publisher explains the content, purpose, or origin of the text.</xs:documentation>
            </xs:annotation>
          </xs:enumeration>
        </xs:restriction>
      </xs:simpleType>
    </xs:union>
  </xs:simpleType>
</xs:attribute>