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URLs for-ever
Semantic Web is supposed to be distributed, so while you can count on Google’s or FOAF’s URLs being reachable “forever”, that might not be true for some mom-n-pop-turtle-collection URLs. Would you be able to read metadata from page that is 20 years old?
It would be nice if archive.org or such could be used as a fallback for those URLs. Can it be done? (I mean in standard reliable manner, not just “implement that in your client if you want”).