The P-Structure Author: Paul Groth Last Modified: 15 June 2003 (Root Element Start Here) An instance of the p-structure. Each instance of the p-structure contains a set of message exchangess. A message exchange record describes the client and service view of a particular message exchange including the state of each actor with in the context of the exchange. Identifies a service in an message exchange . A serviceId is of type of Identity. The contents of Identity implementation specific. The sink of the message within the service. Identifies the client in an message exchange . The source of the message within the client. A URI that uniquely identifies this message exchange . The client's view of the message exchange . The service's view of the message exchange . Assertion about the MessageExchange Information supplied by an actor about its state in the context of this MessageExchange . Examples include the script that was used in running a service or the time when an invocation was sent/received. Describes a relationship between a p-assertion or another p-assertion. This can be seen as a triple: subject identifier, relation, object identifier. The actual link to the PS. A URL pointing to the relation. A relation could denote that an interaction is a response or request to this interaction.