I've prepared the following XForms document based on http://www.w3.org/MarkUp/Forms/wiki/XForms_2.0#The_var_element:
<?xml-stylesheet type="text/xsl" href="../xsltforms/xsltforms.xsl"?>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xf="http://www.w3.org/2002/xforms">
<head>
<title>var-demo</title>
<xf:model>
<xf:instance>
<data xmlns="">
<PersonGivenName>Kilroy</PersonGivenName>
</data>
</xf:instance>
</xf:model>
</head>
<body>
<xf:output value="PersonGivenName"><xf:label>PersonGivenName=</xf:label></xf:output>
<xf:var name="pg_name" value="PersonGivenName"/>
<xf:output value="pg_name"><xf:label>pg_name=</xf:label></xf:output>
</body>
</html>
It is very simple: should output (I think) Kilroy twice, first read directly from the model, then putting into a variable and printing that variable.
But the output is only
PersonGivenName=Kilroy
pg_name=
I've tried this from eXist-db 2.0 and eXide version 2.0. The code above is processed by XSLTforms; omitting the first line, it's processed by betterForm - but the result is the same.
The examples after chapter "3.2.4.2 Variable Scope" in http://www.w3.org/MarkUp/Forms/wiki/XForms_2.0 suggest that a $ prefix is needed when the value of the variable is used, but both XSLTforms and betterForm throw exception on changing the last output to value="$pg_name". The code above seems to be syntactically correct, but the value of the variable is not printed out. Can anybody explain this?
Sorry, variables are not implemented yet in XSLTForms.
I frequently define a dedicated instance for "variables".
-Alain