| http://www.w3.org/ns/prov#value | - Suitable aggregating agents include, for example, halides such as chloride, bromide or iodide, or anions such as acetates, acetoacetates or sulfates, of vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, nickel, copper, zinc, cadmium and/or silver; aluminum salts such as aluminum sulfate, aluminum acetate, polyaluminum chloride and/or aluminum halides;
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