. "The term oxide(s) of metal(s) includes: (1) one or more metal oxides (i.e., compounds described by the general formula Mx Oy wherein M is a metal and the subscripts x and y designate the relative atomic proportions of metal and oxide in the composition) and/or (2) one or more oxygen-containing metal compounds, provided that such oxides and compounds have the capability of performing to produce h" . . . .