2.1.762 Part 1 Section 18.10.1.37, group (OLAP Group)
a. The standard does not define limitations on the valid values for the id attribute.
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Office requires that the value of the id attribute be greater than 0.
b. The standard does not define a length limitation to the value of @uniqueParent.
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Office limits the value of @uniqueParent to 65535 characters.
c. The standard does not place limits on the length of @caption, @name, and @uniqueName.
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Office assumes that for @caption, @name, and @uniquename, if the value of pivotCacheDefinition@createdVersion is less than 3, the maximum length of these attributes is 255 characters.