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IOptions::WeightChar Property
__property BSTR WeightChar;

Character used to indicate term weighting (example: apple:5) The prefix used to add field name in front of a word in an xfilter expression is a doubling of the weightChar (default "::"). For example, if you change the WeightChar to !, then an xfilter expression with a field would look like this:

xfilter(word "FieldName!!Something")