Changing Default Namespace within XSLT Transformation

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Within an XSLT transformation, I'm trying to switch the default namespace
within a section of the generated XML document to a shared namespace.
This way, the content of this section does not have to use a prefix for
the shared namespace, thus making the document smaller and easier to read.

This worked in .NET 1.1 with no problem, but now appears to be broken in
2.0. When you try to do this, the following XslTransformExc eption is
generated:

Cannot construct namespace declaration xmlns='uri:shar edSchema'.
Prefix '' is already mapped to namespace 'uri:documentSc hema'.

The XSLT looks similar to this:

<?xml version="1.0" encoding="utf-8"?>
<xsl:styleshe et version="1.0"
xmlns:xsl="http ://www.w3.org/1999/XSL/Transform"
xmlns:d="uri:do cumentSchema"
xmlns:s="uri:sh aredSchema">

<xsl:template match="/">
<myDocument xmlns="uri:docu mentSchema">
... Output document items ...
<d:sharedInfo xmlns="uri:shar edSchema">
... Output shared schema items ...
... (Child items do not use a prefix) ...
</d:sharedInfo>
</myDocument>
</xsl:template>

</xsl:stylesheet>

Maybe I'm missing something. Is this error correct?

Thanks,
-Dave Baskin

[Bjoern Hoehrmann]

* DFB wrote in microsoft.publi c.dotnet.xml:

>Within an XSLT transformation, I'm trying to switch the default namespace
within a section of the generated XML document to a shared namespace.
This way, the content of this section does not have to use a prefix for
the shared namespace, thus making the document smaller and easier to read.

This worked in .NET 1.1 with no problem, but now appears to be broken in
2.0. When you try to do this, the following XslTransformExc eption is
generated:

Cannot construct namespace declaration xmlns='uri:shar edSchema'.
Prefix '' is already mapped to namespace 'uri:documentSc hema'.

The XSLT looks similar to this:

<?xml version="1.0" encoding="utf-8"?>
<xsl:styleshe et version="1.0"
xmlns:xsl="http ://www.w3.org/1999/XSL/Transform"
xmlns:d="uri:do cumentSchema"
xmlns:s="uri:sh aredSchema">

<xsl:template match="/">
<myDocument xmlns="uri:docu mentSchema">
... Output document items ...
<d:sharedInfo xmlns="uri:shar edSchema">
... Output shared schema items ...
... (Child items do not use a prefix) ...
</d:sharedInfo>
</myDocument>
</xsl:template>

</xsl:stylesheet>

Maybe I'm missing something. Is this error correct?

Could you post a minimal yet complete transformation and a corresponding
XML document so we could try to reproduce this problem? I do not think
there is anything wrong with your transformation, so either there is
something you did not show us, or this is a bug or limitation in the
XSLT processor you are using.
--
Björn Höhrmann · mailto:bj****@h oehrmann.de · http://bjoern.hoehrmann.de
Weinh. Str. 22 · Telefon: [phone] · http://www.bjoernsworld.de
68309 Mannheim · PGP Pub. KeyID: 0xA4357E78 · http://www.websitedev.de/

[Martin Honnen]

DFB wrote:

XslCompiledTran sform xsltTran = new XslCompiledTran sform();

xsltTran.Transf orm( xmlDoc, xsltArgs, xmlWriter );

<xsl:styleshe et
version="1.0"
xmlns:xsl="http ://www.w3.org/1999/XSL/Transform"
xmlns:xsi="http ://www.w3.org/2001/XMLSchema-instance"
xmlns:d="uri:do cumentSchema"
xmlns:s="uri:sh aredSchema">

<xsl:output method="xml" version="1.0" encoding="utf-8" indent="yes" />

<xsl:template match="/">
<xsl:apply-templates select="body"/>
</xsl:template>

<xsl:template match="body">
<document xmlns="uri:docu mentSchema">
<docItems/>
<d:sharedItem s xmlns="uri:shar edSchema">
<sharedItem/>
<xsl:apply-templates/>
</d:sharedItems>
</document>
</xsl:template>

</xsl:stylesheet>
And this input XML document:

<?xml version="1.0" encoding="utf-8"?>
<body/>

I think you have hit a bug in XslCompiledTran sform.

Maybe someone of the XML teams picks this up.

Complete stack trace I get with XslCompiledTran sform and that stylesheet
and input XML documents above (simply doing Transform("inpu t.xml",
"result.xml ")):

Unhandled Exception: System.Xml.Xsl. XslTransformExc eption: Cannot
construct namespace declaration xmlns='uri:shar edSchema'. Prefix '' is
already mapped to namespace 'uri:documentSc hema'.
at
System.Xml.Xsl. Runtime.XmlQuer yOutput.WriteNa mespaceDeclarat ion(String
prefix, String ns)
at <xsl:template match="body">(X mlQueryRuntime
{urn:schemas-microsoft-com:xslt-debug}runtime, XPathNavigator
{urn:schemas-microsoft-com:xslt-debug}current)
at <xsl:template match="/">(XmlQueryRunt ime
{urn:schemas-microsoft-com:xslt-debug}runtime, XPathNavigator
{urn:schemas-microsoft-com:xslt-debug}current)
at Root(XmlQueryRu ntime {urn:schemas-microsoft-com:xslt-debug}runtime)
at Execute(XmlQuer yRuntime
{urn:schemas-microsoft-com:xslt-debug}runtime)
at System.Xml.Xsl. ExecuteDelegate .Invoke(XmlQuer yRuntime runtime)
at System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument ,
XmlResolver dataSources, XsltArgumentLis t argumentList,
XmlSequenceWrit er results)
at System.Xml.Xsl. XmlILCommand.Ex ecute(Object defaultDocument ,
XmlResolver dataSources, XsltArgumentLis t argumentList, XmlWriter
writer, Boolean closeWriter)

at System.Xml.Xsl. XmlILCommand.Ex ecute(XmlReader contextDocument ,
XmlResolver
dataSources, XsltArgumentLis t argumentList, Stream results)
at System.Xml.Xsl. XslCompiledTran sform.Transform (String inputUri,
String resultsFile)
at Test2007010501. Test.Main(Strin g[] args)

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Dave F. Baskin]

I posted this issue to the Visual Studio feedback web site:

https://connect.microsoft.com/Visual...dbackID=250185

Thanks for the help,
-Dave

[ElenaDubinets]

Thanks.
This is indeed a bug in XslCompiledTran sform.

Thanks for reporting it.
Sergey

Dave F. Baskin wrote:

I posted this issue to the Visual Studio feedback web site:

https://connect.microsoft.com/Visual...dbackID=250185

Thanks for the help,
-Dave