Message Subsets

From the MMT RDM you will now be familiar with some of the core classes in use from the RDM, but now how to put these together and use the nested structure of MMT, the best way is to see some examples in use so you can understand how they relate to each other and get a feeling of how they work in a structure.
The Transport Contract is a good example of this as it covers the classes we have covered and across multiple modes of transport, so there are lots of commonality in how it is used, as evidenced in the Transport Contract Matrix.
The below diagram shows the Ocean Waybill (Bill of Lading) as an example:
Ocean Waybill Example Subset from MMT
The nested structure of MMT defines the hierarchy of the subset, this is already contained in the MMT RDM, and can be navigated from the downloadable deliverables under the UN/CEFACT streamlined standards page. This structure, classes and attributes have been built up over many years of contributions from the community of UN/CEFACT, there are very rare occasions when new elements need to be added to meet new business requirements, these are created as submissions to the library maintenance team as a Data Maintenance Request (DMR) who maintain the quality and integrity of the models for UN/CEFACT.
We suggest that you look at some message guides and structures that you are familar with and apply your knowledge and the reference materials here to navigate these subsets. There are tools available that you can use to navigate these subsets and the data structure(s) and build your own models.