URN UUID question

[Joel Kalvesmaki <[e-mail]>]

I am developing an XML data model that requires users to name versions of a
document. Each version's name should be unique, but patterned to allow
anyone (human or computer) to associate it with the names of other versions
of that document and to place it in chronological sequence. The name of
each version must be a single string, specifically a IRI/URI (to
facilitate, among other things, straightforward declarations in RDF). It
should not be split into two elements. Naming must be as decentralized as
possible.

My favored scheme for naming these entities would concatenate a UUID (any
style), a middle delimiter, and an ISO date/dateTime, e.g.,

urn:uuid:f60330fd-1900-44ac-a825-de70074e142e::2014-02-07Z
urn:uuid:f60330fd-1900-44ac-a825-de70074e142e::2014-02-28T00:20:58.3Z

Would it be misleading to begin such a string with "urn:uuid:" and if so,
what are the alternative best practices?

Perhaps there already exists a urn scheme that does what I intend?

Are there any other issues I should consider before adopting a naming
scheme like this?

Best wishes,

jk
-- 
Joel Kalvesmaki
kalvesmaki.com