1. A method for performing service discovery, comprising: receiving, via a processor, a query generated by a user using a generalized scenario tree view tool for discovering a service, wherein the query comprises a task requirement; searching a registry in accordance with the query for identifying a candidate service that satisfies the query, wherein the registry comprises a plurality of service descriptions corresponding to a plurality of service nodes, where each one of the service descriptions is provided in accordance with a behavior model that describes a service provided by a respective one of the plurality of service nodes and, wherein the behavior model is constructed by a respective one of the plurality of service nodes, wherein the behavior model standardizes shared domain ontologies that define terminology for a service provided by the respective one of the plurality of service nodes; and monitoring the service provided by the respective one of the plurality of service nodes in response to the query to ensure that the service complies with the behavior model provided by the respective one of the plurality of service nodes.