<?xml version="1.0" encoding="Windows-1251"?>
<xsl:stylesheet 
  xmlns="http://www.someaddr.com"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:msxsl="urn:schemas-microsoft-com:xslt"
  xmlns:user="http://www.contoso.com"
  version="1.0">

    <xsl:variable name="books">
        <book author="Michael Howard">Writing Secure Code</book>
        <book author="Michael Kay">XSLT Reference</book>
    </xsl:variable>

    <xsl:template match="/">
        <authors>
           <xsl:for-each select="msxsl:node-set($books)/book"> 
                <author><xsl:value-of select="@author"/></author>
            </xsl:for-each>
        </authors>
    </xsl:template>
</xsl:stylesheet>

<?xml version="1.0"?>
<authors xmlns:msxsl="urn:schemas-microsoft-com:xslt" xmlns:user="http://www.co
ntoso.com">
    <author>Michael Howard</author>
    <author>Michael Kay</author>
</authors>

<xsl:stylesheet 
  xmlns="http://www.someaddr.com"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:msxsl="urn:schemas-microsoft-com:xslt"
  xmlns:user="http://www.contoso.com"
  version="1.0">

<?xml version="1.0"?>
<authors xmlns="http://www.someaddr.com" xmlns:msxsl="urn:schemas-microsoft-com
:xslt" xmlns:user="http://www.contoso.com"/>