xml:base 

See http://www.w3.org/TR/xmlbase/ for
information about this attribute.

Attribute Information

Used By

Elements alternativeSet, control, cpfDescription, description, eac-cpf, identity, multipleIdentities, relations, sources
Attribute Groups base, xml:specialAttrs

Source 

<xs:attribute name="base" type="xs:anyURI">
  <xs:annotation>
    <xs:documentation>See http://www.w3.org/TR/xmlbase/ for information about this attribute.</xs:documentation>
  </xs:annotation>
</xs:attribute>

Sample