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This is in addition to regular meta tags.
The DC I've found stands for Dublin Core.
Google on "dublin core" for the project's homepage.
It's my guess that Google pays no attention to the meta tags used by the DCMI.
It's a NISO/ISO standard [niso.org...]
I've been hearing about "Dublin Core" for a long
time (say seven years or so). It may have advantages
but I have always been a skeptic about it.
It's "publication meta-data", you know, for "books" (ISBN)
and Serials perhaps (JAMA for instance, Journal of the
American Medical Association) that kind of thing.
It's been disappointing to me because it does not appear
to define a canonical way to refer to a Serial (journal,
magazine, etc) publication. It just says "Identifier"
as one of the meta-data elements. Maybe they are right
to do that in the long-term but there are a huge number
of pubs that everyone cites with "Journal X, Volume #Y,
Issue #Z, Page #P".
I suppose they are right, really, but the real-world hasn't
met their expectations yet.
Are there any SEs that understand the "publication date"
of something as opposed to the date the file was created
or updated? This is something that meta-data like DC
(a host of other existing and proposed meta-data standards) would actually help.
If you need to know anything really specific about DC,
let me know and we can email. I have a decade of experience in this
area.
=Scott
