| http://www.w3.org/ns/prov#value | - ; a branched or straight chain alkenyl radical having from 2 to 6 carbon atoms, preferably from 2 to 4 carbon atoms, such as vinyl or allyl; a branched or straight chain alkoxy radical having from 1 to 6 carbon atoms, preferably from 1 to 4 carbon atoms, such as methoxy, ethoxy, propoxy, isopropoxy and butoxy; an acyl group having from 2 to 6 carbon atoms; or a radical of the following formulae:
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