2.1.720 Part 1 Section 18.8.42, tableStyles (Table Styles)
a. The standard specifies @defaultTableStyle as xsd:string.
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Office requires @defaultChanged to be an xsd:string whose length is between 1 and 255 inclusive.
b. The standard specifies @defaultPivotStyle as xsd:string.
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Office requires @defaultPivotStyle to be an xsd:string whose length is between 1 and 255 inclusive.