"uid" microformats? (was Re: [uf-discuss] ISBN mark-up)

Etan Wexler ewexler at stickdog.com
Mon Apr 24 19:56:58 PDT 2006

Tantek Çelik wrote to the Microformats Discuss mailing list on 
2006-04-24 in “Re: "uid" microformats? (was Re: [uf-discuss] ISBN 
mark-up)” (<mid:C0725C5A.6D364%25tantek at cs.stanford.edu>, 

> hCard normatively references vCard for semantics, which says:
> 3.6.7 UID Type Definition
>    Type purpose: To specify a value that represents a globally unique
>    identifier corresponding to the individual or resource associated
>    with the vCard.

I wrote to Microformats Discuss about the “UID” type’s definition and 
the implications in “[uf-discuss] "uid" microformats?” (2006-04-24, 
<mid:444D8E63.7010501 at stickdog.com>, 

> Third, I actually see disadvantages in using URIs as a basic unit rather
> than URLs.

All URLs are URIs. What have I missed?

> Thus as a pattern we should use URLs in microformats, not URIs.

If you mean that we should use URIs with authoritative 
location/retrieval semantics, I agree. If you mean that we should use 
URIs whose location/retrieval semantics include broad network 
accessibility, I agree. Goodbye, “file” scheme! Goodbye, “tag” scheme!

> OTOH, an opaque UID which asserts nothing but "globally unique identifier"
> (see above) is both quite simple, and much more "backwards compatible" with
> use of UID in vCard/iCalendar applications today.

How are people publishing “UID” properties in vCards today?

Etan Wexler.

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