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https://issues.apache.org/jira/browse/XALANJ-2334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12551215
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Mike Brown commented on XALANJ-2334:
------------------------------------
I'm the originator of this issue, but will not be able to test the fix anytime
soon. I'd appreciate it if someone else could verify it on my behalf. Thanks.
> Namespace nodes are generated for empty namespace
> -------------------------------------------------
>
> Key: XALANJ-2334
> URL: https://issues.apache.org/jira/browse/XALANJ-2334
> Project: XalanJ2
> Issue Type: Bug
> Components: Xalan
> Affects Versions: 2.7
> Reporter: Mike Brown
> Assignee: David Marston
> Priority: Minor
> Fix For: 2.7.1
>
> Attachments: xalan2334-tests.patch, xmlns.xml, xmlns.xsl
>
>
> When elements in the empty namespace (no namespace) are descendants of nodes
> in some other unprefixed namespace, in Xalan is reporting namespace nodes for
> the default, empty namespace -- i.e., it is saying there are namespace nodes
> that have an empty string-value and empty local-name corresponding to
> xmlns="".
> The first paragraph of XPath 1.0 section 5.4 and the behavior of other
> processors indicates such nodes are not part of the XPath data model. That
> is, it is impossible to have a namespace node whose string-value is an empty
> string; namespace nodes only indicate what *non-empty* namespaces are in
> scope.
> The presence of the extra nodes is redundant; it's implicit that the element
> is in no namespace if it has no namespace nodes with an empty local-name.
> The following example demonstrates. The stylesheet serializes the 'e'
> elements, showing their namespace node information. Elements 1-4 have
> extraneous namespace nodes. The others are fine.
> xmlns.xml
> ==========
> <data>
> <group xmlns="http://example.com/foo";>
> <!--e elements in empty namespace, ancestors in non-empty namespace-->
> <group xmlns="">
> <e>one</e>
> <e>two</e>
> <group>
> <e>three</e>
> <e>four</e>
> </group>
> </group>
> <!--e elements in same non-empty namespace as ancestor-->
> <group>
> <e>five</e>
> <group>
> <e>six</e>
> </group>
> </group>
> </group>
> <!--e elements and ancestors in non-empty namespace-->
> <group>
> <e>seven</e>
> </group>
> </data>
> xmlns.xsl
> ==========
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
> <xsl:output method="xml" indent="yes"/>
> <xsl:template match="/">
> <xsl:apply-templates select="//*[local-name()='e']"/>
> </xsl:template>
> <xsl:template match="*[local-name()='e']">
> <Element content="{.}">
> <xsl:for-each select="namespace::*">
> <Namespace prefix="{local-name()}">
> <xsl:value-of select="."/>
> </Namespace>
> </xsl:for-each>
> </Element>
> </xsl:template>
> </xsl:stylesheet>
> expected
> =========
> <?xml version="1.0" encoding="UTF-8"?>
> <Element content="one">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> </Element>
> <Element content="two">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> </Element>
> <Element content="three">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> </Element>
> <Element content="four">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> </Element>
> <Element content="five">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> <Namespace prefix="">http://example.com/foo</Namespace>
> </Element>
> <Element content="six">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> <Namespace prefix="">http://example.com/foo</Namespace>
> </Element>
> <Element content="seven">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> </Element>
> actual (with Xalan-J 2.7.0)
> =======================
> <?xml version="1.0" encoding="UTF-8"?>
> <Element content="one">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> <Namespace prefix=""/>
> </Element>
> <Element content="two">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> <Namespace prefix=""/>
> </Element>
> <Element content="three">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> <Namespace prefix=""/>
> </Element>
> <Element content="four">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> <Namespace prefix=""/>
> </Element>
> <Element content="five">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> <Namespace prefix="">http://example.com/foo</Namespace>
> </Element>
> <Element content="six">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> <Namespace prefix="">http://example.com/foo</Namespace>
> </Element>
> <Element content="seven">
> <Namespace prefix="xml">http://www.w3.org/XML/1998/namespace</Namespace>
> </Element>
> I have a real-world stylesheet that serializes elements as character data, in
> XML syntax, in an HTML textarea. I rely on the namespace axis to faithfully
> report what namespaces are in scope. I'd like to not have to go out of my way
> to ignore extra namespace nodes in this one XSLT processor.
> Thanks for considering this issue.
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