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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: RE: Semantic Web
 > That is why Joshua's example of USENET is > interesting. A global ontology. One assumes > the users have to police it themselves. There are two pieces to it: * Global and public distribution/aggregation network: When you publish something on USENET, it is immediately available to anyone who subscribes to USENET. The medium is public -- anyone can publish into USENET. Web pages, by contrast, require you to publish to a privately-owned site, and require the reader to deliberately connect to your private site to consume what you published. In such a system, the metadata is only available to the person who can "crawl" for it. Push vs. Pull. Pull is ideal for the web, but push is ideal for semantic web. * Subject-Sensitive Filtering: In a "push" model, the amount of metadata being pushed around globally will be overwhelming. People need the ability to filter out stuff they don't care about. The newsgroup hierarchy could be seen as an ontology, but I think of it as a very weak one. More like a set of "channels" that people can tune into or broadcast on. It's possible to post a message about Oracle in the Microsoft newsgroup, and there is a chance that someone will be able to answer your question. But the channels exist so that people/applications can voluntarily provide some filtering information. I'm not saying that such "Channels" are *necessary* to a semantic web, since ideally you could establish filters automatically based on any metadata characteristic. But USENET is an example of where someone already solved the problem (albeit in a limited and low-tech way) Architecturally, I think decentralized "push" and subject-oriented "filtering" are essential for the semantic web. And USENET (or IRC for low-latency) is the definitive subject-oriented push communication system. 
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