<xs:simpleType name="language" id="language">
    <xs:annotation>
        <xs:documentation source="http://www.w3.org/TR/xmlschema-2/#language" />
    </xs:annotation>
    <xs:restriction base="xs:token">
        <xs:pattern value="[a-zA-Z]{1,8}(-[a-zA-Z0-9]{1,8})*" id="language.pattern">
            <xs:annotation>
                <xs:documentation source="http://www.ietf.org/rfc/rfc3066.txt">
            pattern specifies the content of section 2.12 of XML 1.0e2
            and RFC 3066 (Revised version of RFC 1766).
          </xs:documentation>
            </xs:annotation>
        </xs:pattern>
    </xs:restriction>
</xs:simpleType>