| http://www.w3.org/ns/prov#value | - The hydrocarbyl bridging group is preferably aliphatic and has a chain of 1-4 carbon atoms; preferably the group is of formula (CR7R8)d e.g. (CHR8)d where each of R7 and R8, which may be the same or different, represents hydrogen or hydrocarbyl e.g. of 1-20 carbons such as 1-6 carbons or 6-20 carbons, such as methyl or ethyl and d is an integer of 1-4 preferably 2 or especially 1; advantageously t
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