| http://www.w3.org/ns/prov#value | - ) R1 is tri or tetravelent when R2 and R3 are covalently bonded to each other and to the same dioxycarbon atom to form a heterocyclic ring or a heterocyclic ring substituted with an alkyl, alkoxy or alkenyl when R2 is an alkyleneoxy or alkenyleneoxy and R3 is an alkyleneoxy, alkenyleneoxy or alkylene; f) R1 is tri or tetravalent when R2 and R3 are covalently bonded to each other and to the same di
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