| http://www.w3.org/ns/prov#value | - where M??? is Mg, Mn and/or Ca; t is a number from 0.5 to 2; M??? is a transition metal such as Ti, V and/or Zr; X is a halogen, preferably Cl, Br or I; Y may be the same or different and is halogen, alone or in combination with oxygen, ???NR2, ???OR, ???SR, ???COOR, or ???OSOOR, where R is a hydrocarbyl radical, in particular an alkyl, aryl, cycloalkyl or arylalkyl radical, acetylacetonate anion
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