2.1.649 Part 1 Section 18.3.1.83, sheetPr (Chart Sheet Properties)

a.   The standard specifies @codeName can be any xsd:string.

Office requires @codeName to be less than 32 characters with the following pattern restriction: [\p{L}\P{IsBasicLatin}][_\d\p{L}\P{IsBasicLatin}]*.

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