| http://www.w3.org/ns/prov#value | - More precisely, R1 is preferably --X--R3 -- wherein X is --O--, --S-- or --N(R4)-- where R4 is a hydrogen atom, an alkyl group or an aryl group, and R4 and R3 may combine into a ring which may further contain a hetero atom such as nitrogen or may have an unsaturated bond). --O-- is preferable for --X--.
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