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Google is great if what you're looking for is "all files on the web" and if you're able to deal with the fact that it takes a long time for some new files to get into the Google index. However, if you want to build a more timely application, you might want to consider using the service provided at http://weblogs.pubsub.com/advanced .
We constantly monitor over 1 million blogs and allow users to create content-based subscriptions that will generate custom RSS feeds of the content we find. A specific search feature that we offer that is particularly relevant to RDF folk is the ability to search for "Referenced URIs". With this you can tell us that you want be notified in near real-time of any item that contains a reference to a particular URI. Thus, I might create a URI such as "urn:psi:pubsub.com:20040209:BobsProposalForPSIinAtom:1" and others might (using an example from Danny Ayers) comment on this uri with the following RDF:
<Subject rdf:about="urn:psi:pubsub.com:20040209:BrendasProposal:1">
<ibis:supports rdf:resource="urn:psi:pubsub.com:20040209:BobsProposalForPSIinAtom:1" />
</Subject>
If you had a subscription at PubSub.com to the URI "...BobsProposal..." then you would see the RDF saying that Brenda supported it just a few moments after that RDF was posted to her blog. Thus, if you had an RDF application reading the results file we generate, you could accumulate assertions about the URI almost in real-time -- rather than having to wait as long as a few weeks for Google to find the data.
Take a look at http://pubsub.com. I think you'll find that what we do is pretty interesting for RDF application development.
bob wyman
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