2.1.662 Part 1 Section 18.3.1.99, worksheet (Worksheet)
a. The standard states that the maxOccurs value for the conditionalFormatting child element is unbounded.
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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.
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Excel ignores the drawingHF element.