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This article has been viewed 11513 times.

Prevent Namespace Prefixes from Being Copied to the Output

Written by Gregory Scot Collins

Tuesday, 2 May 2006, 10:02 AM

This article has been tested to work with the following products and versions. No guarantee of compatibility, with or without modification, is offered for products or versions other than those listed.

JavaScript 1.7 (Netscape Communications)
HTML 4.01 (W3C)
XML 1.0 (W3C)
XPath 1.0 (W3C)
XSLT 1.0 (W3C)

IN THIS ARTICLE:

Any namespace prefix specified on the xsl:stylesheet element is automatically copied to your output. If, for example, your XSLT employs JavaScript code, the specified namespace prefix required to call the JavaScript functions will be copied to your output. Let's create some test files to demonstrate the issue and the solution.

Create the source files

We need a simple XML file to transform. Copy the contents of Listing 1 into a text editor, and then save the file as Test.xml.

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="Test.xsl"?>
 
<Root>
    <Title>Braintrove</Title>
    <Body>Visit http://www.Braintrove.com</Body>
</Root>

Listing 1. The Test.xml file.

Copy the contents of Listing 2 into a text editor, and then save the file as Test.xsl. Be sure to save it in the same folder the as Test.xml file.

<?xml version="1.0"?>
<xsl:stylesheet version="1.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns:msxsl="urn:schemas-microsoft-com:xslt"
        xmlns:js="JavaScript">
 
<msxsl:script language="JavaScript" implements-prefix="js">
<![CDATA[
    function UpperCase(Value)
    {
        return Value.toUpperCase();
    }
 
    function LowerCase(Value)
    {
        return Value.toLowerCase();
    }
]]>
</msxsl:script>
 
<xsl:template match="Root">
    <html>
        <head>
            <title>
                <xsl:value-of select="js:UpperCase(string(Title))"/>
            </title>
        </head>
        <body>
            <xsl:value-of select="js:LowerCase(string(Body))"/>
        </body>
    </html>
</xsl:template>
 
</xsl:stylesheet>

Listing 2. The Test.xsl file.

Applying the transform to our XML results in the following output:

    <head>
        <title>BRAINTROVE</title>
    </head>
    <body>visit http://www.braintrove.com</body>

</html>

In many situations the additional namespace prefixes will not pose a problem; however, you might prefer to have them not present. This is easily fixed.

Update the XSLT to exclude specific namespace prefixes from the output

You can prevent specific namespace prefixes from being copied to your output by using the optional exclude-result-prefixes attribute on the xsl:stylesheet element. Use a whitespace separator between each prefix you want excluded from your output.

Listing 3 shows the addition of the exclude-result-prefixes attribute, highlighted in green:

<?xml version="1.0"?>
<xsl:stylesheet version="1.0" 
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns:msxsl="urn:schemas-microsoft-com:xslt"
        xmlns:js="JavaScript"
        exclude-result-prefixes="msxsl js">
 
<msxsl:script language="JavaScript" implements-prefix="js">
<![CDATA[
    function UpperCase(Value)
    {
        return Value.toUpperCase();
    }
 
    function LowerCase(Value)
    {
        return Value.toLowerCase();
    }
]]>
</msxsl:script>
 
<xsl:template match="Root">
    <html>
        <head>
            <title>
                <xsl:value-of select="js:UpperCase(string(Title))"/>
            </title>
        </head>
        <body>
            <xsl:value-of select="js:LowerCase(string(Body))"/>
        </body>
    </html>
</xsl:template>
 
</xsl:stylesheet>

Listing 3. The updated Test.xsl file excludes the specified namespaces from the output.

Applying the updated transform to our XML results in the following output that correctly excludes the additional namespace prefixes:

<html>

    <head>
        <title>BRAINTROVE</title>
    </head>
    <body>visit http://www.braintrove.com</body>

</html>

Copyright ©2006 Braintrove. All rights reserved. This material may not be copied, published, broadcast, rewritten or redistributed. You may, however, use the techniques, along with any associated code and files in your development. This material is provided "AS IS" without warranty of any kind. You accept full responsibility and liability for any and all results associated with use of this material.

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		List of Figures
	Listing 1 - The Test.xml file.
	Listing 2 - The Test.xsl file.
	Listing 3 - The updated Test.xsl file excludes the specified namespaces from the output.

		Article Tags
	CDATA exclude-result-prefixes HTML JavaScript Lowercase msxsl:script Namespace Prefix Namespaces Style Sheets Transforms Uppercase XML XPath XSLT

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Copyright © 2006-2010 Braintrove. All rights reserved. Braintrove, braintrove.com, and the Braintrove logo are trademarks of Gregory Scot Collins in the United States and/or other countries. The names of actual companies and products mentioned herein may be the trademarks of their respective owners. Any rights not expressly granted herein are reserved.