RE: [xsl] (possible) strange behaviour of JD.xslt

Subject: RE: [xsl] (possible) strange behaviour of JD.xslt
From: "Oleg Tkachenko" <olegt@xxxxxxxxxxxxx>
Date: Wed, 7 Nov 2001 21:14:38 +0200
> I'm trying to get a javax.xml.transform.Transformer from the xsl:
> <?xml version="1.0" encoding="ISO-8859-1"?>
> <xsl:stylesheet xmlns:xsl="";
> version="1.0" xml:space="preserve">
> <xsl:output method="xml" omit-xml-declaration="yes"/>
> <xsl:template match="/">
> <xsl:choose>
>    <xsl:when test="*some text*">Value 1</xsl:when>
>    <xsl:otherwise>Value 2</xsl:otherwise>
> </xsl:choose>
> </xsl:template>
> </xsl:stylesheet>
> I can do that with many XSLT processors but I would like to use JD.xslt
> (I've found it the fastest processor made in Java). This processor throws
> the message: "Invalid child node 'null' for a xsl:choose element". If I
> remove the attribute *xml:space="preserve"* or I write no whitespaces
> between tags <xsl:choose>,<xsl:when> and <xsl:otherwise> all works fine.
> I guess the JD.xslt builds a tree from this xsl file with some text nodes
> (whose node value is several spaces and node name is null), and when it
> checks the childs of <xsl:choose> only allows <xsl:when> and
> <xsl:otherwise> but it finds this text nodes.

I think jd.xslt does right (btw, saxon behaves the same way), because xslt1.0
spec says those whitespace only text nodes (you have 3 of them in your <xsl:choose>) must be preserved:
A text node is preserved if any of the following apply:

The element name of the parent of the text node is in the set of whitespace-preserving element names.
The text node contains at least one non-whitespace character. As in XML, a whitespace character is #x20, #x9, #xD or #xA.
An ancestor element of the text node has an xml:space attribute with a value of preserve, and no closer ancestor element has xml:space with a value of default.

One of the possible workarounds I see is to put xml:space="default" attribute to <xsl:choose> element, this will allow xslt processor to strip these superfluous whitespace only text nodes: 
<xsl:choose xml:space="default">
	<xsl:when test="*some text*">Value 1</xsl:when>
	<xsl:otherwise>Value 2</xsl:otherwise>

Oleg Tkachenko,
Multiconn International, Israel 

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