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I don't think one-to-one search is a good idea. URLs are already one-to-one. If you're worried about page moves, how are you going to verify the page's content? The way Google and other search engines do it now works fine: if you search for a unique phrase in the document, you'll find it. If you type a few words in the document, you'll get the most authoritative one with those words, whether or not it's the exact one you had in mind. IMHO, this is a better system. After all, there are so many web pages and even more unique URLs (for example, database-driven sites), that the ID numbers would be long and barely usable. Even so, they'd be virtually useless since web pages are still accessed by URL anyway.
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