Subject: RE: XSLT 2.0: Cast does not allow an empty sequence
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Thu, 19 Jul 2007 09:09:02 +0100
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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: 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" ≠ "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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