is a name for a message.
- You can specify messages by defining values for .
- is converted to MessageName[symbol, "tag"]. tag can contain any characters that can appear in symbol names. symbol::"tag" can also be used.
- Assignments for are stored in the Messages value of the symbol s.
- The f::usage message is typically defined for functions intended for general use, giving a description of how to use the function.
- ?f prints out the message f::usage.
- When ?form finds more than one function, only the names of the functions are printed.
- You can switch on and off messages using On[s::tag] and Off[s::tag].
- MessageName[symbol, "tag", "lang"] or represents a message in a particular language.
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