Abstract: Method and service node (10) for providing a service in a communication network (1). The service node (10) is arranged to evaluate a request comprising an expression (A), a function of multiple elements. The elements (eventually) relate to data originating from context sources (B, D, E) available in the communication network (1). Each of the one or more context sources (B, D, E) has an associated context source weight for a query by the service. The context source (E) for which evaluation of the expression has a lowest expression evaluation weight is determined, based on the associated context source weights, and this context source (E) is interrogated first.

Abstract: Rule creation engine for application in a service (5) provided in a telecommunication network (1). The rule creation engine (8) is in communication with a user terminal (10) and a database (6). The rule creation engine (8) is arranged to create an expression set, which comprises a relationship between stimulioriginating from and responses intended for the behavior of the service (5) in the telecommunication network (1), to detect one or more inconsistencies in the expression set. Furthermore, the rule creation engine is arranged to recursively determine a set of alternatives which needs the least user interaction to resolve the inconsistencies, translate the set of alternatives in a mathematical function, send to the user terminal (10) possible alternatives to resolve the mathematical function, receive from the user terminal (10) one of the possible alternatives, and update the expression set in the database (6) using the received alternative.

Abstract: Method and service node (10) for providing a service in a communication network (1). The service node (10) is arranged to evaluate a request comprising an expression (A), a function of multiple elements. The elements (eventually) relate to data originating from context sources (B, D, E) available in the communication network (1). Each of the one or more context sources (B, D, E) has an associated context source weight for a query by the service. The context source (E) for which evaluation of the expression has a lowest expression evaluation weight is determined, based on the associated context source weights, and this context source (E) is interrogated first.

Abstract: Method for providing a service in a communication network (1), and service node (10) arranged to execute that service. The service node (10) is arranged to receive and evaluate a request from the service, the request comprising an expression having multiple elements. Each element relates to data originating from one or more context sources (B, D, E), which can provide the data to the service node (10), e.g. using context source proxies (B?, D?, E?). Each context source (B, D, E) updates its associate data using a request based mechanism or an event trigger based mechanism. One of the plurality of elements is selected, and if the selected element evaluates to false, the selected element is switched to a trigger mode. If the selected element evaluates to true, then a further element is interrogated.