Custom XPath Functions feature page updated

I've done an updated draft of the Custom XPath Functions feature, for 
possible inclusion in XForms 1.2.
The prior page had not been updated in a long time, but there were a lot 
of concerns about it because it was based on creating XPath variables. 
This version eliminates variables in favor of an internal instance. 
It comes out a lot cleaner this way, and it also enabled me to easily 
solve pretty much all of the related problems we were having.  It is, at 
least, a better "strawman" worth further discussion.

It would be very powerful to have this extension mechanism as a way to 
enable authors to create more powerful forms that work across 
implementations.

Cheers,
John M. Boyer, Ph.D.
STSM, Interactive Documents and Web 2.0 Applications
Chair, W3C Forms Working Group
Workplace, Portal and Collaboration Software
IBM Victoria Software Lab
E-Mail: boyerj@ca.ibm.com 

Blog: http://www.ibm.com/developerworks/blogs/page/JohnBoyer
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