XSLT 3.0 development branch, using as="xs:integer" on xsl:variable containing xsl:number

[Martin Honnen]

I am using the latest Apache Xalan XSLT 3.0 development branch and find 
some odd behaviour when using

  <xsl:variable name="n" as="xs:integer">

    <xsl:number/>

  </xsl:variable>

that yields an error "(javax.xml.transform.TransformerException): 
XTTE0570 : XSL variable n's value doesn't conform to variable's type 
declaration xs:integer"

I would expect the 'as="xs:integer"' attribute to cast the value of the 
variable to an xs:integer (see 
https://www.w3.org/TR/xslt-30/#variable-values explaining "Value is 
obtained by evaluating the sequence constructor, adjusted to the type 
required by the as attribute")

Any thoughts as to why this is not working? I think that worked previously.


Full code examples:

XSLT:


<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
                xmlns:xs="http://www.w3.org/2001/XMLSchema";
                exclude-result-prefixes="#all"
                expand-text="yes"
                version="3.0">

<xsl:mode on-no-match="shallow-copy"/>

<xsl:template match="chapter">
   <xsl:variable name="n" as="xs:integer">
     <xsl:number/>
   </xsl:variable>
   <xsl:comment>Processing {node-name()} number {$n}</xsl:comment>
   <xsl:copy>
     <xsl:apply-templates select="@*"/>
     <xsl:apply-templates/>
   </xsl:copy>
</xsl:template>

</xsl:stylesheet>


XML


<book title="Example book">
  <chapter id="ch1">
    <section>..</section>
    <section>
      <para>..</para>
      <para><!-- paragraph in section --></para>
    </section>
  </chapter>
  <chapter id="ch2">
    <section>..</section>
    <section>
      <para>..</para>
      <para><!-- paragraph in section --></para>
    </section>
  </chapter>
  <chapter id="ch3">
    <section>..</section>
    <section>
      <para>..</para>
      <para><!-- paragraph in section --></para>
    </section>
  </chapter>
  <chapter id="ch4">
    <section>..</section>
    <section>
      <para>..</para>
      <para><!-- paragraph in section --></para>
    </section>
  </chapter>
  <chapter id="ch5">
    <section>..</section>
    <section>
      <para>..</para>
      <para><!-- paragraph in section --></para>
    </section>
  </chapter>
  <chapter id="ch6">
    <section>..</section>
    <section>
      <para>..</para>
      <para><!-- paragraph in section --></para>
    </section>
  </chapter>
</book>