CruiseControl.NET : Configuration Preprocessor

Original link:

http://build.sharpdevelop.net/ccnet/doc/CCNET/Configuration%20Preprocessor.html

http://cruisecontrolnet.org/projects/ccnet/wiki/index

 

For example:

 

<cruisecontrol xmlns:cb="urn:ccnet.config.builder">

   <!-- Included files (site-specific) -->

  <cb:include href="Config.xml" />

  <cb:include href="EMail.xml" />

  <cb:include href="Project.xml" />

</cruisecontrol>

 

What does "cb:include" mean? 

Is there any other similar definitions? How should I use them? 

 

Take above links for reference.