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A topic identifies what a publication is about. It consists of a character string.
We can use any characters within the single-byte character set for which the machine is configured in a topic string. However, a topic string might need to be translated to a different character representation, so you are recommended to use only those characters that are available in the configured character set of all relevant machines. Topic strings are case sensitive, and a blank character has no special meaning. A null character terminates the string and is not considered to be part of it.
Subscribers can specify a topic or range of topics, using wildcards, for the information that they want.
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