Hi Chris,
don't know. In a O'Reilly about Google's RDFa support, Guha says that they draw and plan to draw from existing vocabularies.
"And we're not going to do this all by ourselves. As it is, we are drawing from
several sources. We're drawing from microformats. We're drawing from vCard. And there are
other places that you will see. And there's other people who know more about their topics
than we could possibly know. And we'll draw on all of these things. So to come back and
answer your question, we hope that the scope of this will be substantially more than the
scope of all the particular data types that work today by microformats."
If you take a look at their "person" page, you will find out that
"drawing" seems to refer to: we read existing format, create one of our
own, and drop any linkage to existing stuff.
This is not a big deal since one only has to create linkage between this
vocab and their owns (the ones their systems understand) to make their
data meaningful. But this tells much on their mindset (compared to
Yahoo! for example).
And if you take a look at the vocab they produced, it is not even to
enhance any existing ontology...
Take care,
Fred
