[ubl-cmsc] Use Cases

[Matthew Gertner <matthew.gertner@schemantix.com>]

I have exchanged some mails with Tim McGrath, who chairs the Core Library
SC, and he has generously offered to nominated some "volunteers" (standard
management practice... :-) to provide some context-related use cases. I will
let you know as soon as we move forward with this. In the meantime, if
anyone is willing to volunteer to take a coordinating role, please let us
know.

Cheers,
Matt