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Subject: Re: [regrep] Re: [ebxml-cppa] CPP identification revisited


Message text written by Christopher Ferris
>
These UID identifiers, while recognizable by "those in the know"
aren't in any way guaranteed to be unique. This issue has been
hashed over ad nauseum in the CPP/A and MSG lists with regards
to identifiers for parties such as DUNS numbers (Duane's Unique
Numbering Scheme:)
<<<<<<<<<<<<<<

Chris,

That's not strictly true.  Within a Registry they are unique, and when
you combine "Registry" + "UID" it is then unique.

In this regard the Registry acts like a namespace and within that
namespace the UID is unique.

Is anything ever guaranteed truely unique across the galaxy?
Probably not!

By combining the business domain, and registry with the UID to
create what amounts to a compound address / identifier you do
get a solid system that for all practical applications will avoid
collisions.

Just like in namespace if I have:

 xmlns:disa   pointing to the .mil gov folks

and

 xmlns:disa pointing to the EDI X12 folks you have an issue
that might bite you - but there are practical ways to avoid
collisions.  The same applies to UID / Registry.

Thanks, DW.



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