Specifies the base encoding.
Use this property to specify the predefined encoding - that is one of the: "MacRomanEncoding", "MacExpertEncoding" or "WinAnsiEncoding".
Base encoding is an encoding from which the
Differences entry describes differences.
If this entry is not present, base encoding is specified implicitly: whether as a font program built-in encoding or a font's built-in encoding (for non-symbolic fonts).