[libreoffice-users] What's syntax of xforms Edit Element Constraint Condition?

I'm using LibreOffice 3.5.7.2 with Build ID: 350m1(Build:2) running on 
ubuntu:

~/temp $ uname -a
Linux evansl-Inspiron-531 3.2.0-54-generic #82-Ubuntu SMP Tue Sep 10 
20:08:42 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

When creating an XML Form Document, I'm having trouble using the
editor for my instance data.  The interface looked about like the
following:

Element ---------------
 Name           [Tax]
 Default Value  [.01]
Settings --------------
Data Type       [Floating point]
[ ] Required    [Condition]
[ ] Relevant    [Condition]
[ ] Constraint  [Condition]
[ ] Read-only   [Condition]
[ ] Calculate   [Condition]

I checked the Constraint row, expecting that when I then
clicked on the [Condition] button, I would be able to provide
some expression, such as:

  0 < Tax

However, when I started to enter this, I got as far as:

  0 <

and the message:

  Error during evaluation

appeared in the Result window.  When I completed the entry to arrive
at:

  0 < Tax

the message:

  False

appeared in the Result window.  So, I just tried:

  Tax

and got a blank Result window.

What sort of expression is expected in the Condition window?
The help button just sent me to:

  _Condition_

  Enter a condition

  _Result_

  Displays a preview of the result

which wasn't any help.

Thanks for any help.

-regards,
Larry


--
To unsubscribe e-mail to: users+unsubscribe@global.libreoffice.org
Problems? http://www.libreoffice.org/get-help/mailing-lists/how-to-unsubscribe/
Posting guidelines + more: http://wiki.documentfoundation.org/Netiquette
List archive: http://listarchives.libreoffice.org/global/users/
All messages sent to this list will be publicly archived and cannot be deleted