| http://www.w3.org/ns/prov#value | - This demands staff that aren???t always available, and the results might be skewed by any number of chance factors in play during the observation periods ??? If the weather is unusually nice, or if the use profile is very different on weekends than on weekdays (when most of the observations are made), or if the World Cup is on TV and everyone???s inside glued to their couch, then the hours of obse
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