2.1.764 Part 1 Section 18.10.1.39, groupLevel (OLAP Grouping Levels)
a. The standard does not limit the length of the value of the caption attribute.
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Excel restricts the value of this attribute to be at most 255 characters when the createdVersion attribute on the pivotCacheDefinition element is less than 3 and 32767 characters otherwise.
b. The standard does not limit the length of the value of the uniqueName attribute.
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Excel restricts the value of this attribute to be at most 255 characters when the createdVersion attribute on the pivotCacheDefinition element is less than 3 and 32767 characters otherwise.