2.1.652 Part 1 Section 18.3.1.83, sheetPr (Chart Sheet Properties)
a. The standard specifies @codeName can be any xsd:string.
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Office requires @codeName to be less than 32 characters with the following pattern restriction: [\p{L}\P{IsBasicLatin}][_\d\p{L}\P{IsBasicLatin}]*.