Processes any includes.
Include syntax is:
$[]
To include a file, relative or absolute:
$[services/foo.jproperties]
$[services/bar.properties|parse=false,failonerror=false]
Can also accept method includsion:
$[method://java.lang.System.getProperties()]
or URL based inclusion:
$[http://foo.bar.com/baz.properties]