[Xsltforms-support] Label element in XForms itemset

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Alain,

I would like to use xf:output/@value with an XPath expression to generate
the contents of an xf:itemset label inside an xf:select1. This should be
valid in XForms, unless I am mistaken. However, in XSLTForms 1.0, I get an
error when I try to do this:

TypeError: Cannot read property 'xfElement' of null
    at XsltForms_output.XsltForms_element.init (xsltforms.js:9319)
    at new XsltForms_output (xsltforms.js:10565)
    at xsltforms_initImpl (itemset-label-test.xhtml:42)
    at xsltforms_init (itemset-label-test.xhtml:76)

See attached form and data file (also pasted below) to reproduce the issue.
Thanks in advance.

Form:

<?xml-stylesheet href="xsltforms/build/xsltforms.xsl" type="text/xsl"?>
<?xsltforms-options debug="yes"?>
<?css-conversion no?>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:xf="
http://www.w3.org/2002/xforms">
   <head>
      <title>Itemset test</title>
      <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

      <xf:model>
         <xf:instance>
            <data xmlns="">
               <current/>
            </data>
         </xf:instance>
      </xf:model>

      <xf:model id="entries">
         <xf:instance src="entries.xml"/>
      </xf:model>

   </head>
   <body>
      <div class="container-fluid wrapper">
         <xf:select1 ref="/data/current" appearance="minimal"
incremental="true">
            <xf:label>Select a title to compare: </xf:label>
            <xf:itemset model="entries" ref="/data/entry">
               <!-- Works with xf:label/@ref -->
               <!-- <xf:label ref="title"/> -->
               <!-- But not with nested xf:label/xf:output/@value -->
               <xf:label>
                  <xf:output value="substring(title, 1, 50)"/>
               </xf:label>
               <xf:value ref="identifier"/>
            </xf:itemset>
         </xf:select1>
         <xf:output ref="/data/current">
            <xf:label>Current title: </xf:label>
         </xf:output>
      </div>
      <br />
   </body>
</html>

Data:

<?xml version="1.0" encoding="UTF-8"?>
<data>
    <entry>
        <identifier>2017387103</identifier>
        <title>Una famiglia tra Siena e l'Europa : i Montucci, 1762-1877
/famiglia tra Siena e l'Europa : i Montucc...</title>
    </entry>
    <entry>
        <identifier>2017452585</identifier>
        <title>Tipologie e modalità della mediazione nella Grecia antica :
le fonti letterarie /Tipologie e modalit...</title>
    </entry>
    <entry>
        <identifier>2017452511</identifier>
        <title>Identità sotto chiave : lingua e stile nel teatro di Saverio
La Ruina /Identità sotto chiave : lingu...</title>
    </entry>
</data>

Best regards,
Tim

--
Tim A. Thompson
Discovery Metadata Librarian
Yale University Library