<?xml version="1.0" encoding="iso-8859-1"?>
<?xml-stylesheet href="../xsltforms/xsltforms.xsl" type="text/xsl"?>
<?xsltforms-options debug="no"?>
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://www.w3.org/1999/xhtml"
      xmlns:xf="http://www.w3.org/2002/xforms"
      xmlns:ev="http://www.w3.org/2001/xml-events"
      xmlns:xsd="http://www.w3.org/2001/XMLSchema"
>
<head>
	<title>Constraint</title>
	<style type="text/css">
	body { font-family: sans-serif}
	label { display: inline-block; width: 8em; margin: 0 1em; text-align: right }
	</style> 
	<model xmlns="http://www.w3.org/2002/xforms">
		<instance><data xmlns="">
		    <birth/><death/><years/>
                  </data>
	        </instance>
		<bind nodeset="death" constraint=". &gt;= ../birth"/>
		<bind nodeset="years" readonly="true()" calculate="../death - ../birth"/>
	</model>
</head>
<body>
    <group xmlns="http://www.w3.org/2002/xforms">
	<input incremental="true" ref="birth"><label>Year of birth:</label></input><h:br/>
	<input incremental="true" ref="death"><label>Year of death:</label></input><h:br/>
	<output ref="years"><label>Number of years:</label></output>
    <br/>
    </group>
</body>
</html>
