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Re: How to output the unused namespaces in the XML do

Subject: Re: How to output the unused namespaces in the XML document?
From: Evan Lenz <evan@xxxxxxxxxxxx>
Date: Mon, 30 Aug 2010 14:18:55 -0700
Re:  How to output the unused namespaces in the XML  do
Your solution includes a lot of repeat messages. You also don't check for whether attributes use the namespace. Here's one that avoids both problems:

<xsl:template match="/">
<xsl:for-each select="//namespace::*[not(. = (preceding::*|../ancestor::*)/namespace::*)]">
<xsl:if test="not((//* | //@*)[namespace-uri(.) = current()])">
This namespace is unused: <xsl:value-of select="."/>

Things are much easier in XSLT/XPath 2.0 (assuming current() bound to document node):

distinct-values(//namespace::*)[not(. = (current()//*|current()//@*)/namespace-uri(.))]

Neither of our solutions checks for unused prefixes, e.g., if the document had multiple declarations for the same URI but uses only one of the prefixes on element/attribute names. That could be done in XSLT 2.0, but whether or not it would work in XSLT 1.0 is dependent on how your processor implements name(). (XPath 2.0 provides direct access to what prefix was used, but XPath 1.0 does not.)

Keep in mind that the above tests don't guarantee that the namespace isn't "used." If your input document is XSLT, XSD, or any other vocabulary that uses QNames in content, you can't safely assume the namespace isn't being used.


Evan Lenz
Lenz Consulting Group, Inc.
+1 (360) 297-0087

Costello, Roger L. wrote:
Hi Folks,

Consider this XML document:

<?xml version="1.0"?>
<N1:NumberList xmlns:N1="http://www.example1.org"
        <Number xmlns:N3="http://www.example3.org">70</Number>

Notice that there are three (3) namespaces, but two of them are unused:


I want an XSLT transform that will output all the unused namespaces in the input XML document.

Here's the solution I came up with:

<xsl:template match="*">
<xsl:variable name="elem" select="." />
<xsl:for-each select="namespace::*[. != 'http://www.w3.org/XML/1998/namespace']">
<xsl:variable name="ns" select="." />
<xsl:if test="not($elem/ancestor::*[namespace::* = $ns])">
<xsl:if test="not($elem/descendant-or-self::*[namespace-uri() = $ns])"> This namespace is unused: <xsl:value-of select="$ns" />
<xsl:apply-templates select="*" />

Is there a better solution? (I am using XSLT 1.0)


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