| http://www.w3.org/ns/prov#value | - example --O--, --S-- or --NH--, for example pyran, thiopyran, pyridine or quinoline; or a 6-membered heterocyclic ring containing more than one ring member other than carbon, such as --N--, for example diazines, such as oiazine, miazine, dihydrouracil of the formula ##STR14## (in which R8 is as defined above) or piazine, vicinal, asymmetrical or symmetrical triazine or 1,2,3,4-triazine, 1,2,3,5-tr
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