For those interested in the innards of the MXF format, the EBU (European Broadcasting Union) have published a technical document specifying what they want from non-tape based camcorders for broadcast production. It can be found here:
http://www.ebu.ch/CMSimages/en/tec_doc_t3301_v1-2005_tcm6-40955.pdf

"Metadata for non-tape-based camcorders for broadcast production." Holy cow, a 30-page white paper and an excellent read! Many thanks for sharing this, David -- much appreciated!