MessageName

symbol::tag is a name for a message.

You can specify messages by defining values for symbol::tag.

symbol::tag 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 s::tag are stored in the Messages value of the symbol s.

The following messages are typically defined for built-in functions:

?f prints out the message f::usage.

When ?form finds more than one function, only the names of each function are printed.

You can switch on and off messages using On[s::tag] and Off[s::tag].

MessageName[symbol, "tag", "lang"] or symbol::tag::lang represents a message in a particular language.

See The Mathematica Book: Section 2.8.21.

See also: Message, MessageList, $MessageList.