[DFDL-WG] Does DFDL support nesting (recursion)?

MIME supports infinite nesting. For example, a message can have the content type multipart/mixed, which means that there will be multiple body parts, each of which can have its own content type. And, any of those body parts can have the content type multipart/mixed, which means that the part will have multiple subparts, each of which can have its own content type. Etc etc etc...and so now we have infinite nesting. Any pointers on DFDL's support for something like this? TIA