base (as an attribute name)

 denotes an attribute whose value
 provides a URI to be used as the base for interpreting any
 relative URIs in the scope of the element on which it
 appears; its value is inherited.  This name is reserved
 by virtue of its definition in the XML Base specification.


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

<xs:attribute name="base" type="xs:anyURI">
    <xs:annotation>
        <xs:documentation>
            <div>
                <h3>base (as an attribute name)</h3>
                <p>
       denotes an attribute whose value
       provides a URI to be used as the base for interpreting any
       relative URIs in the scope of the element on which it
       appears; its value is inherited.  This name is reserved
       by virtue of its definition in the XML Base specification.</p>
                <p>
      See <a href="http://www.w3.org/TR/xmlbase/">http://www.w3.org/TR/xmlbase/</a>
      for information about this attribute.
     </p>
            </div>
        </xs:documentation>
    </xs:annotation>
</xs:attribute>