DocumentID: ECMA-376/Part1/9.1.1
Title: ECMA-376, Part1: 9.1.1 Part Names
Extracted-From: ECMA-376 Office Open XML File Formats, 1st Edition / December 2006
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9.1.1 Part Names

An Office Open XML part name shall contain only ASCII characters, in non-escaped or escaped form. The following ASCII characters are permitted in non-escaped form: "!", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-", ".", the decimal digits "0"--"9", ":", ";", "=", "@", the Latin alphabetic characters "A"--"Z" and "a"--"z", "_", and "~". All other ASCII characters are permitted only when escaped as an encoded triplet of the form "%HH", where H is a hexadecimal digit.]