http://www.w3.org/ns/prov#value | - it is important that implementations do not use safe methods (e.g. GET and HEAD) to perform unsafe operations (e.g. writing data). [???] since HTTP defines GET as "safe, caches and other proxies will assume (based on the spec) that it is fine to perform pre-fetch on these URIs and/or cache and replay the responses as needed.
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