A description document for a service offered by a server in a communication network comprises a first abstract part adapted to describe at least one message exchanged on the communication network when a service is implemented and a second concrete part adapted to describe the information relating to the transmission of the messages over the communication network. This service description document comprises, in the first abstract part, a description of abstract constraints associated with a binary multimedia document. It has particular use for validating a multimedia document from the extraction (E11) of the description of abstract constraints and the extraction (E12) of the MPEG7 description of this multimedia document.