2.2.1 SpreadsheetML Extensibility Elements

When the global elements f, ref, or sqref are contained within an ext ([ISO/IEC29500-1:2016] section 18.2.7) element and contain cell references, an application can adjust these cell references when the worksheet layout changes, even when the containing ext element ([ISO/IEC29500-1:2016] section 18.2.7) is not recognized by the application. See [ISO/IEC29500-3:2015] section 10.1.2 for more details about how extension lists are used.