2.1.659 Part 1 Section 22.214.171.124, worksheet (Worksheet)
a. The standard states that the maxOccurs value for the conditionalFormatting child element is unbounded.
Excel limits the occurrences of this element to 2147483647.
b. The standard specifies that the drawingHF element is a valid child element of the worksheet element.
Excel ignores the drawingHF element.