Mapping programs that come under the same namespace can reference and use each other:
The Java classes of an archive can be used in the
user-defined functions of a message mapping provided that the archive is in the same namespace as the message mapping.
Java classes in different archives can use each other provided that the archives are in the same namespace.
XSLT programs in different archives can include or import each other provided that the archives are in the same namespace. It is also possible to call Java methods from an XSLT mapping (see:
References Between Mapping Programs