Abstract: Embodiments of the present invention address deficiencies of the art in respect to Web services construction and provide a novel and non-obvious method, system and computer program product for message-oriented Web services construction. A method for the message oriented construction of a Web service can include graphically assembling a selection of message flow primitives defining an operation for a Web service, interconnecting selected ones of the message flow primitives to represent a flow of messages from one interconnected message flow primitive to another interconnected message flow primitive, and generating Web service logic from the selection of message flow primitives. The method further can include interpreting or executing the Web service logic in response to receiving a request to invoke the Web service.