2.1.1522 Part 1 Section 21.2.2.144, pivotSource (Pivot Source)
a. The standard states that the maxOccurs value for the extLst child element is unbounded.
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Office limits the occurrences of this element to 1.
b. The standard states that possible values for child element fmtId are defined by type xsd:unsignedInt.
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In Office, child element fmtId has a maximum value of 2147483647.