1. A method for providing data handling information for use by a client of a publish/subscribe service to handle data published by the publish/subscribe service, the method comprising: receiving, from a client of the publish/subscribe service, a subscription request to a data tuple that includes source data; providing, in response to the request, a first subscription for the client to the data tuple; automatically providing a second subscription 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, wherein the first subscription is distinct from the second subscription; generating, pursuant to the first subscription, a first notification message including the source data; and generating, pursuant to the second subscription, a second notification message including the data handling information, wherein the first and second notification messages are distinct from one another.