Defining the action attribute for submitInfo

Does the action attribute for a submitInfo element have to contain a
specific URI, or could you use an XPath expression to evaluate one?  I have
a form that could go "back" to any one of three possible previous forms, and
would like to use XPath to specify this in the action attribute, but all
examples I can see mention specific web-pages or one form or another.
 
Cheers,
Carryl


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