f elements that specify the formulas, numeric values, or cell references that specify the operands for the ST_ConditionalFormattingOperator ([ISO/IEC29500-1:2011] section 18.18.15) specified by operator. If operator is "between" or "notBetween", f MUST contain two formulas; otherwise, f MUST contain one formula.
expression
An f element that specifies a formula. When the formula returns zero, conditional formatting is not displayed. When the formula returns a nonzero value, conditional formatting is displayed.
colorScale, dataBar, iconSet
An f element that specifies a formula. When the formula returns zero, conditional formatting is not displayed. When the formula returns a nonzero value, or is not present, conditional formatting is displayed.
containsText, notContainsText, beginsWith,
endsWith,
containsBlanks, notContainsBlanks,
containsErrors,
notContainsErrors
An f element that specifies a formula that implements the operation specified by type. When the formula returns zero, conditional formatting is not displayed. When the formula returns a nonzero value, conditional formatting is displayed.
colorScale: A CT_ColorScale element that specifies a color scale.
dataBar: A CT_DataBar element that specifies a data bar.
