All very helpful and informative - thanks Toby!
Toby A Inkster wrote:
James Tindall:
Incidentally however, this vcard validator now complains that uid should
not appear twice on a page with the same value?
http://hcard.geekhood.net/?url=microformats.tumblr.com
There is no prohibition on reusing UIDs in the hCard spec, but
hcard.geekhood.net goes far beyond the spec with regards to suggesting
best practices and things you might have missed. In general, I think
it's a good tool, but in this case I (personally) disagree with it.
If Joe has an hCard for himself on his index.html and another hCard
for himself on his contact-me.html, then nobody would think twice
about giving them both the same UID. So if two hCards on different
pages can have the same UID, then why not two hCards on the same page?
What is important (and again this is just my opinion) is that if two
hCards do have the same UID (whether they're on different pages or the
same page), then they should be referring to the same contact (person,
organisation, place, whatever).
To back up my argument, I'll cite the vCard spec (RFC 2426) which
defines the purpose of "UID" as:
To specify a value that represents a globally unique
identifier corresponding to the individual or resource
associated with the vCard.
That is, the UID is a unique identifier for the contact, not a unique
identifier for the card.
I've contacted Kornel about this warning message and suggested that he
change it so that the warning is only issued if two hCards have the
same UID but different FNs.
As an aside, I'll point out that I do *not* recommend using the same
UID for the historic hCards in a resume, because in that situation,
merging details is not the desired behaviour - you want them to be
kept separate.
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