A method for providing data handling information for use by a client of a pub/sub service to handle data published by the pub/sub service includes receiving a subscription request to a data tuple that includes source data from a client of the pub/sub service. When the request is received, a first subscription is provided for the client to the data tuple and a second subscription, distinct from the first subscription, is automatically provided for the client to a data handling tuple that is associated with the data tuple and that includes data handling information defining how the source data of the data tuple is to be handled by the client. A first notification message including the source data is generated and a second notification message, distinct from the first notification message, is generated that includes the data handling information.