RE: [xsl] XSLT 2.0: Cast does not allow an empty sequence

Please check whether this still happens with 8.9.0.4. It feels like a bug
that was fixed.

Michael Kay
http://www.saxonica.com/

 

> -----Original Message-----
> From: Sam Byland [mailto:shbyland@xxxxxxxxxxx] 
> Sent: 19 July 2007 02:49
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: [xsl] XSLT 2.0: Cast does not allow an empty sequence
> 
> Hello again,
> 
> Still debugging the upgrade to XSLT 2.0.  This one took some 
> time to create a reduced stylesheet that still reproduced the 
> error.  The XML instance file (probably irrelevant) is the 
> same as my last post:
> 
> <?xml version="1.0" encoding="UTF-8"?>
> <Test>"Hello" &#x2260; "World"</Test>
> 
> Using SaxonB-8.9j, I get the following error:
> 
> <<Error on line 42 of file:/C:/Test/Saxon/Test20.xsl:
> XPTY0004: Cast does not allow an empty sequence 
> Transformation failed: Run-time errors were reported>>
> 
> with the following XSLT:
> 
> <xsl:stylesheet version="2.0" 
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
>     <xsl:output name="OutHTML" method="html" encoding="windows-1252"/>
> 
>     <xsl:param name="DocumentCode" select=" 'abc11111' "/>
>     <xsl:param name="Flag1" select="boolean( true() or 
> false() )"/> <!-- force to true -->
>     <xsl:param name="Flag2" select="boolean( number( 
> substring( $DocumentCode , 6 , 1 ) ) )"/>
>     <xsl:param name="Flag3" select="substring( $DocumentCode 
> , 6 , 1 )"/>
> 
>     <xsl:variable name="FirstPass" as="document-node()">
>         <xsl:document>
>             <xsl:copy-of select="Test"/>
>         </xsl:document>
>     </xsl:variable>
> 
>     <xsl:template match="Test">
>         <xsl:result-document href="test20.html" format="OutHTML">
>             <xsl:apply-templates select="$FirstPass" mode="SomeMode"/>
>         </xsl:result-document>
>     </xsl:template>
> 
>     <xsl:template match="Test" mode="SomeMode">
>         <html>
>             <head>
>                 <title>test</title>
>             </head>
>             <body>
>                 <p><xsl:call-template name="SomeNamedTemplate"/></p>
>             </body>
>         </html>
>     </xsl:template>
> 
>     <xsl:template name="SomeNamedTemplate">
> 
>         <xsl:variable name="SomeVariable1">
>             <xsl:choose>
>                 <xsl:when test="$Flag3 = '1' and 
> //SomeElement[not(ancestor::Foo)][not(contains(string(Bar),'$'
> ))]">true</xsl:when>
>                 <xsl:when test="$Flag3 != '1' and 
> //SomeElement[not(contains(string(Foo),'$'))]">true</xsl:when>
>             </xsl:choose>
>         </xsl:variable>
> 
>         <xsl:value-of select="$SomeVariable1"/>
> 
>     </xsl:template>
> 
> </xsl:stylesheet>
> 
> *However*, when I try to debug by adding an xsl:message 
> within xsl:variable name="SomeVariable1", the error goes away 
> (?!).  i.e. with this mod:
> 
>         <xsl:variable name="SomeVariable1">
>             <!-- the xsl:message instruction below makes 
> error go away! -->
>             <xsl:message>Flag3: <xsl:value-of 
> select="$Flag3"/>, Cond1: 
> <xsl:value-of
> select="//SomeElement[not(ancestor::Foo)][not(contains(string(
> Bar),'$'))]"/>,
> Cond2: <xsl:value-of
> select="//SomeElement[not(contains(string(Foo),'$'))]"/></xsl:message>
>             <xsl:choose>
>                 <xsl:when test="$Flag3 = '1' and 
> //SomeElement[not(ancestor::Foo)][not(contains(string(Bar),'$'
> ))]">true</xsl:when>
>                 <xsl:when test="$Flag3 != '1' and 
> //SomeElement[not(contains(string(Foo),'$'))]">true</xsl:when>
>             </xsl:choose>
>         </xsl:variable>
> 
> I now get the following in the output, and the transformation 
> continues to the end without any errors:
> 
> <<Flag3: 1, Cond1: , Cond2: >>
> 
> Any thoughts on what is going on here?
> 
> tia,
> 
> ...sam
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