| http://www.w3.org/ns/prov#value | - Examples of halogen-bearing compounds that may be used include aluminum halides of the formula AlXnR 3???n (wherein X is a halogen; R is a hydrocarbon residue of 1 to 20 carbons, such as an alkyl, aryl or aralkyl; and n is 1, 1.5, 2 or 3); strontium halides such as Me3SrCl, Me2SrCl2, MeSrHCl2 and MeSrCl3 (wherein ???Me??? stands for methyl); and other metal halides such as silicon tetrachloride, t
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