I'm new to DITA and have been trying to use conditional text in the DITA Open Toolkit.  I can get the 'include' and 'exclude' actions to work with no issues.  When I use the 'flag' action, the conditional text appears or disappears as desired, however, the 'flag' text does not appear.  By 'flag' text, I mean the text that is supposed to be prepended to the conditional text.

I've searched and searched on the web and tried all possible variations of the 'prop' element with action='flag' but I just can't get it to work.

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I have an automated script running ant, but the some operations I do , need to type the command, give the answers.
If I have something like this:

ant -f file.xml -t pdf -o output_example ...
Where t=target, o=output...

And the other options.
Doing that, I could run ant without someone typing need.