XMI12 — Directory structure for OMG standard XMI documents and DTDs

XMI documents for various OMG standards need to be made available
on the OMG web server in a properly organised directory structure.
The structure need to take account of different versions of the
"domain" standard, different versions of XMI and different versions
of MOF. It should cater for XMI documents and XMI DTDs, and
possibly other representations of metamodels, interfaces and so on.