XMLProperty traversing

[Mark Lybarger]

I'm new to using the XMLConfiguration and the commons configuration in 
general. i have an xml config file such as:

<system type="TEST">
<url name="OutGoingURL">
<value>http://outoging.test.url.com</value>
<type>java.net.URL</type>
</url>
<url name="InBoundURL">
<value>http://incoming.test.url.com</value>
<type>java.net.URL</type>
</url>
</system>
<system type="TEST2">
<url name="OutGoingURL">
<value>http://outoging.test.url.com</value>
<type>java.net.URL</type>
</url>
<url name="InBoundURL">
<value>http://incoming2.test.url.com</value>
<type>java.net.URL</type>
</url>
</system>

in my application i define an environment variable "ENV" and give the value 
of TEST or TEST2, etc. i'd like to be able to do something like 
myConfiguration.getProperty ( 
"//system/type='TEST'/[EMAIL PROTECTED]'OutGoingURL']/value" );

i'm looking to manage internally some jndi url lookups since my app server 
doesn't give me a clean way to configure these per physical app instance.

thanks!