| http://www.w3.org/ns/prov#value | - The formula members W and W1 and W* and Wx are, for example, alkylene groups with 1 to 6 carbon atoms, in particular 2 to 4 carbon atoms, it being possible for the alkylene chain to be interrupted by 1 or 2 hetero groups, which are preferably selected from the groups --O--, --NH-- and --N(R')--, where R' has the above meaning, or an alkylene-phenylene, a phenylene-alkylene, a phenylene-alkylene-ph
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