| http://www.w3.org/ns/prov#value | - Examples of suitable anion donating compound include those compounds which can donate a halogen ion such as an iodine ion, a bromine ion, a chlorine ion, etc., for example, iodine, bromine, chlorine, or those compounds which can donate a sulfate residue, a phosphate residue, a perchlorate residue, etc., for example, sulfuric acid, phosphoric acid, perchloric acid, etc.
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