12. A method of testing access to a service by a client computer in a communication network, from a service description document, comprising the following steps implemented by said client computer: extracting from said service description document, provided by a server computer offering said service, a description of a processing functionality implemented during a preprocessing or the post-processing of data in XML format of a message exchanged during the execution of the service on the communication network; reading, from the extracted description of said processing functionality, a value associated with a property adapted to specify whether the processing must be executed by the client computer; reading, from the extracted description of said processing functionality, a value of a property adapted to specify whether the processing is obligatory or optional; and verifying whether the processing is supported by the client computer in the communication network when said processing is obligatory and must be executed by said client computer in the communication network, wherein said processing functionality also comprises a property adapted to specify whether said pre-processing is carried out on the reception of said message before executing said service or whether said post-processing is carried out on the sending of said message after executing said service.
12. A method of testing access to a service by a client computer in a communication network, from a service description document, comprising the following steps implemented by said client computer: extracting from said service description document, provided by a server computer offering said service, a description of a processing functionality implemented during a preprocessing or the post-processing of data in XML format of a message exchanged during the execution of the service on the communication network; reading, from the extracted description of said processing functionality, a value associated with a property adapted to specify whether the processing must be executed by the client computer; reading, from the extracted description of said processing functionality, a value of a property adapted to specify whether the processing is obligatory or optional; and verifying whether the processing is supported by the client computer in the communication network when said processing is obligatory and must be executed by said client computer in the communication network, wherein said processing functionality also comprises a property adapted to specify whether said pre-processing is carried out on the reception of said message before executing said service or whether said post-processing is carried out on the sending of said message after executing said service. 13. A client computer in a communication network, comprising means adapted to implement the method of testing access according to claim 12 .