<xs:attribute name="dataType" use="required">
    <xs:simpleType>
        <xs:restriction base="xs:token">
            <xs:enumeration value="urn:ogc:data:float" />
            <xs:enumeration value="urn:ogc:data:double" />
            <xs:enumeration value="urn:ogc:data:boolean" />
            <xs:enumeration value="urn:ogc:data:signedByte" />
            <xs:enumeration value="urn:ogc:data:unsignedByte" />
            <xs:enumeration value="urn:ogc:data:signedShort" />
            <xs:enumeration value="urn:ogc:data:unsignedShort" />
            <xs:enumeration value="urn:ogc:data:signedInt" />
            <xs:enumeration value="urn:ogc:data:unsignedInt" />
            <xs:enumeration value="urn:ogc:data:signedLong" />
            <xs:enumeration value="urn:ogc:data:unsignedLong" />
            <xs:enumeration value="urn:ogc:data:UTF-string" />
            <xs:enumeration value="urn:ogc:data:padding" />
        </xs:restriction>
    </xs:simpleType>
</xs:attribute>