In pub-sub messaging, message producers publish messages, and message subscribers consume those messages. If multiple message consumers subscribe to the same topic, each consumer will be given a copy of the message.

Broker's pub-sub messaging mechanism supports the JMS pub-sub messaging model. By default, a JMS topic is represented by a Broker document type of the same name, and the association between the two is through topic and document-type name matching. Message consumers subscribing to topics, known in JMS as durable subscribers, are implemented by Broker clients subscribing to document types.