| http://www.w3.org/ns/prov#value | - M is a cation selected from the group consisting of H+ (i.e., the free carboxylic acid), metal cation (e.g., Na+, K+, Li+, Ca2+, Mg2+, Fe3+, Al3+ or Zn2+), ammonium cation (i.e., H4 N+), substituted ammonium cation (e.g., H1-3 N+ (CH3)3-1, H1-3 N+(C2 H5)3-1, H1-3 N+ (C2 H4 OH)3-1, (CH3)4 N+ or (C4 H9)4 N+), and polyammonium cation (e.g., H3 N+ (C2 H4 NH)0-3 C2 H4 N+ H3); and
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