Recent request from a customer:
What we need to be able to do is to somehow programmatically access, in infopath, the sharepoint form library folder name from which the form was opened.
substring-before(substring-after(/processing-instruction(), 'href="'), '"')
Used as the default value in a text box returns this:
In this case, as you can see from the returned URL, the form was opened from my document library “URITest”