Group, choice,all or sequence XSD

I have this type defined for the element "tag", tag can be an image,quote or format.

<complexType name="Tag">
        <choice minOccurs="0" maxOccurs="unbounded">
            <element name="quote" type="rel:Quote" maxOccurs="1"
                minOccurs="0">
            </element>
            <element name="image" type="rel:Image" minOccurs="0"
                maxOccurs="1">
            </element>
            <element name="format" type="rel:Format" minOccurs="0"
                maxOccurs="1">
            </element>
        </choice>
</complexType>

How can I use for example

<rel:image></rel:image>

instead of

 <rel:tag><rel:image></rel:image></rel:tag>