Additional information about InstanceMetadataSets

[ericdes <eric@vcardprocessor.com>]

I must tell you I'm seriously confused about how to understand and use 
the section InstanceMetadataSets in CVA files. I understand it's 
optional and meant to disambiguate between multiple versions of code 
lists but, really, I don't have to clue how to make use of it. Is there 
any additional documentation?

Sincerely,
Eric Desgranges