<DDDefinition xmlns="http://www.myside.site/ccc/ddd"

That's DDDefinition in the namespace http://www.myside.site/ccc/ddd

<xsl:template match="DDDefinition">
and that matches DDDefinition in the non-namespace "" which isn't the
same thing at all. You want

<xsl:template match="ddd:DDDefinition">

and stick xmlns:ddd="http://www.myside.site/ccc/ddd" in your
xsl:stylesheet.

David

_____________________________________________________________________
This message has been checked for all known viruses by Star Internet
delivered through the MessageLabs Virus Scanning Service. For further
information visit http://www.star.net.uk/stats.asp or alternatively call
Star Internet for details on the Virus Scanning Service.

 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list