Music Exchange Architecture using MusicXML format

Hi,

Some years ago I contacted the MakeMusic people about an architecture that
I had in mind for the exchange of music between composers and musicians via
the MusicXML format. See attached inquiry and response thread.

At that time there was, according to them, no solution in the market that
met my requirements.

I recently wanted to inquire if there are new developments in this area,
but saw that the MusicXML group is now part of the W3C activities.
So I'm now sending this inquiry to you.

I wonder it there are solutions from which you know that more or less offer
the products etc. with which I can implement the aimed architecture. See
attached schema.

Kind regards,

Gert Lems
The Netherlands