2.1.803 Part 1 Section 18.10.2.1, reference (Reference)
a. The standard defines @field (Field Index) values range as unsignedInt and says a value of -2 indicates the data field.
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Office uses the value 4294967294 (a valid unsignedInt) to specify the data field and the @v in the x elements represent indices into the dataFields collection.
b. The standard defines @field values range as unsignedInt.
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Office requires that if the pivotArea@cacheIndex is 0, then the value shall be a valid index in the pivotFields in the pivotTable, and, unless byPosition is 1, @v in the x elements represent indices into items collection of the pivotField.
c. The standard states that the values for the field attribute are defined by the XML Schema unsignedInt datatype.
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Office requires that if the pivotArea@chacheIndex is 1 the value shall be a valid index in the cacheFields in the pivot cache and the v attribute in the x elements represent indices into sharedItems collection of the cacheField.