| http://www.w3.org/ns/prov#value | - Representative examples of modifying agents useful in this embodiment include 2,3- dihydroxy-succinic acid, ethanedioic acid, 2 -hydroxy acetic acid, 2-hydroxy-propanoic acid, 2-hydroxy-l,2,3-propanetricarboxylic acid, methoxyacetic acid, cis-l,2-ethylene dicarboxylic acid, hydroethane- 1 ,2-dicarboxyic acid, ethane- 1 ,2-diol, propane- 1 ,2,3-triol, propanedioic acid, and ??-hydro-??-hydroxypoly(
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