2.1.740 Part 1 Section 18.10.1.4, cacheFields (PivotCache Fields)
a. The standard states that the maxOccurs value for the cacheField child element is unbounded.
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Excel limits the occurrences of this element to 1024 when the value of the createdVersion attribute on the pivotCacheDefinition element is less than 3 and 16384 otherwise.
b. The standard states that the minOccurs value for the cacheField child element is 0.
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Excel requires an occurrence of this element for non-OLAP PivotCaches.