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Re: [xsl] How to output the unused namespaces in the XML document?

2010-08-30 16:28:53
It isn't possible to know whether a namespace is unused. I think what you mean is "not used in any element or attribute name".

The simple answer to that in XPath 2.0 is distinct-values(//namespace::*[not(. = //*/namespace-uri() or . = //@*/namespace-uri())]).

However, your code is testing something different. Given this source document

<?xml version="1.0"?>
<N1:NumberList>
        <Number>23</Number>
        <Number>41</Number>
        <Number xmlns:N3="http://www.example3.org";>70</Number>
        <N3:Number xmlns:N3="http://www.example3.org";>103</Number>
        <Number>99</Number>
        <Number>6</Number>
</N1:NumberList>

You will report http://www.example3.org as unused because there is a declaration of this namespace that is not used in any ancestor or descendant of the element where it is declared; my code considers it as used because there is an element where it is used. As usual, it all comes down to careful specification of your problem.

Michael Kay
Saxonica
Hi Folks,

Consider this XML document:

<?xml version="1.0"?>
<N1:NumberList xmlns:N1="http://www.example1.org";
                xmlns:N2="http://www.example2.org";>
         <Number>23</Number>
         <Number>41</Number>
         <Number xmlns:N3="http://www.example3.org";>70</Number>
         <Number>103</Number>
         <Number>99</Number>
         <Number>6</Number>
</N1:NumberList>

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

     http://www.example2.org

     http://www.example3.org

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:if>
             </xsl:if>
         </xsl:for-each>
         <xsl:apply-templates select="*" />
     </xsl:template>


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

/Roger

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