<attribute name="show">
    <annotation>
        <documentation>

        The 'show' attribute is used to communicate the desired presentation 

        of the ending resource on traversal from the starting resource; it's 

        value should be treated as follows: 

        new - load ending resource in a new window, frame, pane, or other 

              presentation context

        replace - load the resource in the same window, frame, pane, or 

                  other presentation context

        embed - load ending resource in place of the presentation of the 

                starting resource

        other - behavior is unconstrained; examine other markup in the 

                link for hints 

        none - behavior is unconstrained 

      </documentation>
    </annotation>
    <simpleType>
        <restriction base="string">
            <enumeration value="new" />
            <enumeration value="replace" />
            <enumeration value="embed" />
            <enumeration value="other" />
            <enumeration value="none" />
        </restriction>
    </simpleType>
</attribute>

• show
• xlink:show
• xlink:show