If by client you mean processor, then I think I follow. The most obvious thing I can think of is a format string, not unlike formatting dates with “%Y” etc. Some more style guide requirements would help design one that can do them all.
If by client you mean processor, then I think I follow. The most obvious thing I can think of is a format string, not unlike formatting dates with “%Y” etc. Some more style guide requirements would help design one that can do them all.