| http://www.w3.org/ns/prov#value | - In the formula prefered examples of Z include --(CH2)n -- where n is 2 or 3, an alkyl substituted di- or tri-methylene chain, e.g. --CH2 CH(lower alkyl)-, --CH2 C(lower alkyl)2-- or a chain comprising an alkylene group (optionally substituted by lower alkyl) and a hetero group e.g. --OCH2 --, --OC(lower alkyl)2 --, --S.CH2 CH2 -- and --CH2 OCH2 --.
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