2.1.576 Part 1 Section 18.2.15, functionGroups (Function Groups)
a. The standard does not limit the value of @builtInGroupCount.
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Office requires that the maximum value be 255.
b. The standard states that the maxOccurs value for the sequence containing the child functionGroup element is unbounded.
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Excel limits the occurrences of the functionGroup element to 255.
c. The standard states that the values of the builtInGroupCount attribute are defined by the XML Schema unsignedInt datatype.
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Excel restricts the sum of the functionGroup elements plus the value of the builtInGroupCount attribute to be at most 255.