<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.w3.org/XML/1998/namespace" xml:lang="en">
        <xs:attribute name="lang" type="xs:language">
        <xs:annotation>
            <xs:documentation>
                In due course, we should install the relevant ISO 2- and 3-letter codes as the enumerated possible values . . .
            </xs:documentation>
        </xs:annotation>
    </xs:attribute>
    <xs:attribute name="space" default="preserve">
        <xs:simpleType>
            <xs:restriction base="xs:NCName">
                <xs:enumeration value="default"/>
                <xs:enumeration value="preserve"/>
            </xs:restriction>
        </xs:simpleType>
    </xs:attribute>
    <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>
    <xs:attributeGroup name="specialAttrs">
        <xs:attribute ref="xml:base"/>
        <xs:attribute ref="xml:lang"/>
        <xs:attribute ref="xml:space"/>
    </xs:attributeGroup>
</xs:schema>