1. A method for specifying a return of specific data in response to a search query issued to a subscribe and publish communication interface, said method comprising: generating a subscription object containing a primary identifier (ID) of a published data; and including within said subscription object an expression indicating a specific context desired for satisfying the subscription object once the published data is identified on the communication interface; wherein, once the subscription object is placed on the subscribe and publish communication interface, a response to the subscription object is only provided following publication of the published data and a confirmation of the specific context.