Original link:

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

For example:

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

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

  <cb:include href="http://www.mamicode.com/Config.xml" />

  <cb:include href="http://www.mamicode.com/EMail.xml" />

  <cb:include href="http://www.mamicode.com/Project.xml" />

</cruisecontrol>

What does "cb:include" mean? 

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

Take above link for reference.