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In xsl:number, we have the attribute letter-value="alphabetic|traditional", with the default being implementation-dependent. In format-date() and the new format-integer(), a "t" in the picture requests traditional numbering, and there is no way to represent the alternative (alphabetic). This rather forces the system to make alphabetic the default, which is not necessarily desirable. Should we perhaps introduce modifiers T and O (or a and c for alphabetic/cardinal) to represent the converse of t and o?
The XSL WG looked at this and decided to recommend (in both format-date/time and in format-integer) allowing "a" (alphabetic) and "c" (cardinal) to represent the converse of the current modifiers "t" (traditional) and "o" (ordinal), with the default if neither is specified being implementation-dependent. Since the functions are now a joint responsibility, the bug is transferred to F+O for a joint decision to be made.
Accepted by the joint WGs as proposed in comment #1