Hello Toby, James
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.
Nope you will find that the UID is for the entire vcard....
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.
I would say that is wrong too, what is wrong with that is how authors
commonly mark up the UID of a hCard in microformats eg:
<a class="url uid" href="http://myfoosite.com/";>myfoosite</a>
where this all falls apart is that if there is more than one regular
author of a site they might all want to use the same url, Its easily
solvable by adding @id to a hCard and using a relative url
<a class="url uid" href="http://myfoosite.com/#person1";>myfoosite</a>
<a class="url uid" href="http://myfoosite.com/#person2";>myfoosite</a>
All that aside UID should *only* really be used once on a page to define
a single authoritative point of contact, using more than one UID really
seems to defeat the object when you think about it..
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.
Best Wishes.
--
Martin McEvoy
http://weborganics.co.uk/
"You may find it hard to swallow the notion that anything as large and apparently
inanimate as the Earth is alive."
Dr. James Lovelock, The Ages of Gaia
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