| http://www.w3.org/ns/prov#value | - Because you can have a valid XML log file without that constraint, and constraints like that are the sort of detail you don???t want to rely on, because other apps can break them. (To Tim Bray: Part of the point of the Unified Logging Format is that we want other IM/chat clients to use it, which means that we should be forgiving when their output doesn???t exactly match ours.)
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