0xDECAFBAD: What the frell is the Semantic Web?

“Hello computer, find me 2 roundtrip tickets for 7 days anytime in the next 10 weeks, for under US$300 each, to a vacation spot where the weather this time of year is usually warm and sunny, the exchange rate is better than 3 to 1 US dollar, and is rated as better than average by Ann Arbor, MI bloggers.” Assume my semantic web client knows some URLs to airlines, to international weather services, to exchange rates, and to vacation spot reviews in weblogs in Ann Arbor, MI. Assume that there are schema available for the things these URLs describe. Assume that my semantic web client can parse my natural language query.