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make xml_dump available as a string #17
Originally reported by Julian Bond as issue 72
In order to make my caching and fetching scheme more efficient, I had a need to know whether a feed had changed. So what I was doing was taking an MD5 hash of the sanitised output storing it and comparing it. Two things would make this easier. The fetching scheme is to back off collection if the feed is changing much and fetch more frequently if it keeps changing.