The mvel:URL handler allows you to render templates based on the effective profile or runtime properties. You can access the profile object by using the profile variable and runtime properties by using the runtime variable.
For example, the mvel:profile:jetty.xml file refers to the template file called jetty.xml either in the current profile or in a parent profile directory. For more information about the mvel language, refer https://en.wikisource.org/wiki/MVEL_Language_Guide
For the Profile URL handler, you can start up blueprints or spring XML files as a bundle by using the URL with the blueprint or spring URL handlers. bundle.foo = blueprint:mvel:profile:foo.xml bundle.bar = spring:mvel:profile:bar.xml