XSLT

Template

<?xml version="1.0"?>

<xsl:stylesheet version="1.0"

xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:template match="/">

...

<xsl:for-each select="catalog/cd">

...

</xsl:for-each>

...

</xsl:template>

</xsl:stylesheet>

Element Reference

http://www.w3schools.com/xml/xsl_elementref.asp