| http://www.w3.org/ns/prov#value | - Specific examples of X1 to X4 include hydrocarbon groups such as alkyl, alkenyl, cycloalkyl, cycloalkenyl and phenyl groups; oxygen-containing substituents such as hydroxyl, ether, carboxyl, carbonyl and ester groups; nitrogen-containing substituents such as amino, imino, amide and nitrile groups; and organic groups containing some of these substituents and having at least 4 carbon atoms.
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