<xs:element name="img">
    <xs:complexType>
        <xs:attributeGroup ref="attrs" />
        <xs:attribute name="src" use="required" type="URI" />
        <xs:attribute name="alt" use="required" type="Text" />
        <xs:attribute name="longdesc" type="URI" />
        <xs:attribute name="height" type="Length" />
        <xs:attribute name="width" type="Length" />
        <xs:attribute name="usemap" type="URI">
            <xs:annotation>
                <xs:documentation>
          usemap points to a map element which may be in this document
          or an external document, although the latter is not widely supported
          </xs:documentation>
            </xs:annotation>
        </xs:attribute>
        <xs:attribute name="ismap">
            <xs:simpleType>
                <xs:restriction base="xs:token">
                    <xs:enumeration value="ismap" />
                </xs:restriction>
            </xs:simpleType>
        </xs:attribute>
    </xs:complexType>
</xs:element>