[Xsltforms-support] equality constraint

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Hi

I'm trying to implement an equality constraint, but the resulting page
claims that the constraint is never fulfilled. See example below. What
am I doing wrong? BTW the XForms wikibook gives an equality constraint
example where "eq" is used instead of "=" and it says that this does not
work with xsltforms (indeed I get a parsing error). Don't know what is
correct. My example code follows.

    Regards
   Thorsten

<?xml-stylesheet href="xsltforms/xsltforms.xsl" type="text/xsl"?>
<?xsltforms-options debug="yes"?>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ev="http://www.w3.org/2001/xml-events"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xf="http://www.w3.org/2002/xforms">
    <head>
        <title>Create account</title>
        <xf:model>
            <xf:instance xmlns="">
                <person>
                    <password/>
                    <repeatPassword/>
                </person>
            </xf:instance>
            <xf:bind nodeset="password"       type="xs:string"
required="true()"/>
            <xf:bind nodeset="repeatPassword" type="xs:string"
required="true()" constraint=". = password"/>
            <xf:submission id="submit" method="post" action="echo.xql"
replace="all"/>
        </xf:model>
        <style>
				fieldset {
					width: 400px;
				}
				fieldset.NoLabel {
					margin-top: 10px;
				}
				.xforms-label {
					display: inline-block;
					min-width:150px;
					text-align: right;
					margin-right: 20px;
				}</style>
    </head>
    <body>
        <fieldset xmlns="" class="Login">
            <legend>Login</legend>
            <xf:input ref="login">
                <xf:label>Login:</xf:label>
            </xf:input>
            <xf:secret ref="password">
                <xf:label>Password: </xf:label>
            </xf:secret>
            <xf:secret ref="repeatPassword">
                <xf:label>Repeat Password: </xf:label>
            </xf:secret>
        </fieldset>
        <xf:submit submission="submit">
            <xf:label>Send</xf:label>
        </xf:submit>
    </body>
</html>