<element name="title">
    <complexType mixed="true">
        <attributeGroup ref="nitf:globalNITFAttributes" />
        <attribute name="type" use="optional">
            <simpleType>
                <restriction base="string">
                    <enumeration value="main" />
                    <enumeration value="subtitle" />
                    <enumeration value="parttitle" />
                    <enumeration value="alternate" />
                    <enumeration value="abbrev" />
                    <enumeration value="other" />
                </restriction>
            </simpleType>
        </attribute>
    </complexType>
</element>