| http://www.w3.org/ns/prov#value | - tuents may optionally be further substituted. [0236] As the aliphatic hydrocarbon group, mention is made of straight-chain or branched aliphatic hydrocarbon group having 1 to 15 carbon atoms, such as alkyl group, alkenyl group and alkynyl group. [0237] Preferable examples of the alkyl group include Cl-lo alkyl group such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl,
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