| http://www.w3.org/ns/prov#value | - where M is a metal atom, e.g. sodium, lithium, potassium, and calcium, a is the valence of M, and R is an organic group, such as aliphatic (i.e. straight chain, branched chain and if sufficiently large, cyclic, or a combination thereof, such as alkylcycloaliphatic, and the aliphatic skeleton can include heteroatoms, e.g. oxygen bonded only to carbon atoms), aromatic, or a combination thereof, e.g.
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