Re: (no subject)

> try tokens instead of string.

Not quite sure what you mean.  Are you suggesting this:

          <define name="hide">
            <value>hide</value>
          </define>
          <define name="show">
            <value>show</value>
          </define>
          <choice>
             hide
             show
          </choice>

instead of this:

          <choice>
            <value>hide</value>
            <value>show</value>
          </choice>

> alternative is the brute force approach,

Hopefully I can avoid this.