Any way to do includes in struts-config.xml

[Knabe, Rusty]

Is there a way within struts-config.xml to include data from external xml's.
This way struts-config.xml does not get large and so the mappings can be
managed in separate files. Our app has many optional componets, and it would
be nice to be able to just do includes in the struts-config of the pieces.