min/max/avg functions

All,

I did a couple of action items:

- ACTION-2022 - Write text for min/max in compatibility mode. [1]
- ACTION-xxxx: Erik to treat avg the same as min/max in compatibility mode

The diff:


https://www.w3.org/MarkUp/Forms/wiki/index.php?title=XPath_Expressions_Module&diff=4199&oldid=4195

Feedback welcome.

-Erik

[1] https://lists.w3.org/Archives/Public/public-forms/2015Apr/0002.html