Attributes and namespaces are quite different things in the data model, and
it's expressly stated in the language spec that you can't create namespaces
by trying to create an attribute with an "xmlns:" name.
XSLT 2.0 has an xsl:namespace instruction that allows dynamic construction
of namespace nodes.
Michael Kay
-----Original Message-----
From: Mukul Gandhi [mailto:mukul_gandhi(_at_)yahoo(_dot_)com]
Sent: 23 July 2004 13:37
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: Re: [xsl] copy-of "canonicalization" behavior in Xalan (Java)
I wrote this stylesheet
<?xml version="1.0"?>
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0">
<xsl:output method="xml" />
<xsl:template match="node()">
<xsl:copy>
<xsl:attribute
name="xmlns:{substring-before(name(),':')}">
<xsl:value-of select="namespace-uri()" />
</xsl:attribute>
<xsl:for-each select="@*">
<xsl:attribute name="{name()}">
<xsl:value-of select="." />
</xsl:attribute>
</xsl:for-each>
<xsl:apply-templates />
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
When it is applied to the given XML, Xalan produces
error
"Could not resolve namespace prefix: xmlns. The node
will be ignored."
My questions are
1) Is it possible to generate attribute names like
xmlns:something (i.e. how to escape special meaning of
xmlns: in XSLT for namespaces)
2) If this is possible, then is it architecturally
correct?
Regards,
Muku
--- Matthew McKennirey <mmckennirey(_at_)conclusive(_dot_)com>
wrote:
The copy-of element when processed by Xalan (Java)
appears to canonicalize the output, rather than
output the source tree exactly.
For specific nodes in the source tree I would like
to create an identical copy in the result tree,
including redundant namespace
declarations.
Assume a source document like:
<foo:root xmlns:foo="http://abc.org/foo#";
xmlns:xyz="http://xyzinc.com/xyz#";>
<foo:parent xmlns:foo="http://abc.org/foo#";>
<foo:child xmlns:foo="http://abc.org/foo#";>more
text</foo:child>
<xyz:child xmlns:xyz="http://xyzinc.com/xyz#";>yet
more text</xyz:child>
</xyz:parent>
</foo:root>
The namespace declarations on the parent and child
nodes are redundant (their namespace prefixes have
been bound to a namespace on
the root node).
When I use copy-of, such as in the simple template
below, in XML Spy using its built in XSLT processor
the result tree is an exact
and complete copy of the source tree, redundant
namespace declarations and all, as I would expect.
<xsl:template match ="/">
<xsl:copy-of select="(.)"/>
</xsl:template>
(I have simplified the template in the extreme to
make it clear.)
When I run the same template with the Xalan (Java)
XSLT processor, which uses a SAX parser, I get a
"cleaned", canonical form of the
source tree as my result, with all redundant
namespace declarations removed.
This may appear to be a benefit, but I later
manipulate parts of the result tree (which is much
more complex than the simple
example) as separate XML fragments and at that point
the namespace declarations are in fact no longer
redundant but critical.
I have not been able to find anything in the Xalan
documentation which suggests a way to avoid this
canonicalization - perhaps its a
SAX issue? Is there a way to force Xalan to make an
exact copy of the source tree, warts and all?
Thanks
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