| http://www.w3.org/ns/prov#value | - This is because if a method for making a charge is predetermined according to system or if a charge is made based only on a fixed unit, e.g. the frequency of use, this will entail the difficulty of dealing with a variety of works, such as works (of a pay-per-view type) like movies and works (of such a type as can be used over and over without charge once purchased) like books.
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