2.5.5.1 CellRef
The CellRef token specifies a reference to a cell in a reference context.
ABNF:
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cellRef = [sheetref "!"] ( name / NamedCellRef / IndexedCellRef / SingleLetterNamedCellRef ) sheetref = CrossPageRef / DocSheetRef / MasterSheetRef / PageSheetRef / ShapeSheetRef / StyleSheetRef
name is a name of a cell in the web drawing. It MUST be equal to the N attribute of a Cell_Type element that is a child element of the Sheet_Type element in the current reference context or a reference context specified by sheetref.