<xs:element name="link">
    <xs:annotation>
        <xs:documentation>
      Relationship values can be used in principle:

      a) for document specific toolbars/menus when used
         with the link element in document head e.g.
           start, contents, previous, next, index, end, help
      b) to link to a separate style sheet (rel="stylesheet")
      c) to make a link to a script (rel="script")
      d) by stylesheets to control how collections of
         html nodes are rendered into printed documents
      e) to make a link to a printable version of this document
         e.g. a PostScript or PDF version (rel="alternate" media="print")
      </xs:documentation>
    </xs:annotation>
    <xs:complexType>
        <xs:attributeGroup ref="attrs" />
        <xs:attribute name="charset" type="Charset" />
        <xs:attribute name="href" type="URI" />
        <xs:attribute name="hreflang" type="LanguageCode" />
        <xs:attribute name="type" type="ContentType" />
        <xs:attribute name="rel" type="LinkTypes" />
        <xs:attribute name="rev" type="LinkTypes" />
        <xs:attribute name="media" type="MediaDesc" />
    </xs:complexType>
</xs:element>