| http://www.w3.org/ns/prov#value | - filter_urls() just takes a list of urls scraped from the page and checks them against the valid_url() method of the resolver plugins. all this does is checks to see if any of the resolver plugins say they can resolve those urls. it does not actually do any resolving until you call resolve() so this is fast. obviously it does not know whether the files actually exist or not, just whether there is a r
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