[Xsltforms-support] Problem with constraint attribute

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Hi,

I discovered problem with constraint attribute in bind element.

Here is my test xform:

<?xml version="1.0" encoding="utf-8"?>
<?xml-stylesheet type="text/xsl" href="xsltforms/xsltforms.xsl"?>
<html xmlns:xforms="http://www.w3.org/2002/xforms" 
xmlns:ev="http://www.w3.org/2001/xml-events" 
xmlns:an="http://www.together.at/2006/ANOTHER" 
xmlns="http://www.w3.org/1999/xhtml" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns:xpdl="http://www.wfmc.org/2002/XPDL1.0" 
xmlns:xsd="http://www.w3.org/2001/XMLSchema" 
xmlns:xpil="http://www.together.at/2006/XPIL1.0">
<head>
<title>Contact</title>
<xforms:model>

<xforms:instance id="firstInstance">
<xpil:ExtendedWorkflowFacilityInstance>
<xpil:StringDataInstance Id="firstname" 
Value="">INSIDE</xpil:StringDataInstance>
</xpil:ExtendedWorkflowFacilityInstance>
</xforms:instance>

<xforms:bind id="firstname" 
nodeset="instance('firstInstance')/xpil:StringDataInstance/@Value" 
constraint="true()" type="xsd:string" />

</xforms:model>
</head>
<body>
<h2>Contact</h2>
<xforms:group appearance="minimal">

<xforms:input bind="firstname">
<xforms:label>Name</xforms:label>
</xforms:input>

</xforms:group>
</body>
</html>

Problem is that input filed is marked as non-valid inspite 
constraint="true()".
When I enter something in input filed it becomes valid. And when I 
remove value from that input filed it becomes non-valid again.

Is this a bug or I'm missing something?

Regards.