A topic tree is comprised of a plurality of topics that clients can subscribe to and which are organized in a topic hierarchy. A topic selection list comprising a plurality of first topic selector expressions is stored. Each first topic selector expression is an expression that identifies a corresponding first subset of the topic tree which is being subscribed to or unsubscribed from. A second topic selector expression is then identified. The second topic selector expression is an expression that identifies a corresponding second subset of the topic tree which is being subscribed to or unsubscribed from. The plurality of first topic selector expressions are conflated with the second topic selector expression based on whether there is redundancy between the first topic selector expressions and the second topic selector expression.
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