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Level 10

Hi,

It's pretty hard going at times and sometimes includes things that haven't been implemented in Acrobat/Reader but remember to check out the XFA spec http://partners.adobe.com/public/developer/xml/index_arch.html

This explains about the empty string value but also talks about user defined views (not just print / screen) which would be very handy way of hiding some fields under certain conditions so you could define a "summary" view for example ... but that bit hasn't been implemented.

Bruce