rel 

Describes the relationship between the <relatedItem> and the
resource described in the parent element, i.e., <bibl>, <source> or
<relatedItem>. The values are based on MODS version 3.4. The subject of these
relations is always the <relatedItem>, and the object is always the parent of the
<relatedItem>. "preceding" and "succeeding" indicate temporal
order.

Attribute Information

Used By

Element mei:relatedItem

Source 

<xs:attribute name="rel" use="required">
  <xs:annotation>
    <xs:documentation>Describes the relationship between the <relatedItem> and the resource described in the parent element, i.e., <bibl>, <source> or <relatedItem>. The values are based on MODS version 3.4. The subject of these relations is always the <relatedItem>, and the object is always the parent of the <relatedItem>. "preceding" and "succeeding" indicate temporal order.</xs:documentation>
  </xs:annotation>
  <xs:simpleType>
    <xs:restriction base="xs:token">
      <xs:enumeration value="preceding">
        <xs:annotation>
          <xs:documentation>Predecessor of the resource.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="succeeding">
        <xs:annotation>
          <xs:documentation>Successor to the resource.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="original">
        <xs:annotation>
          <xs:documentation>Original form of the resource.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="host">
        <xs:annotation>
          <xs:documentation>Parent containing the resource.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="constituent">
        <xs:annotation>
          <xs:documentation>Intellectual or physical component of the resource.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="otherVersion">
        <xs:annotation>
          <xs:documentation>Version of the resource's intellectual content not changed enough to be a different work.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="otherFormat">
        <xs:annotation>
          <xs:documentation>Version of the resource in a different physical format.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="isReferencedBy">
        <xs:annotation>
          <xs:documentation>Published bibliographic description, review, abstract, or index of the resource's content.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
      <xs:enumeration value="references">
        <xs:annotation>
          <xs:documentation>Cited or referred to in the resource.</xs:documentation>
        </xs:annotation>
      </xs:enumeration>
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>

Sample