The invention concerns a method of describing a function applicable to a computer object, the function being invocable in a first markup language, the function being initially expressed in a predetermined programming language different from the first markup language, characterised in that it includes the steps of: defining (E3) a first tag describing the function, in the first markup language, defining (E6) second tags describing the arguments of the function, these tags being contained in the first tag describing the function and the types of the arguments being expressed in a second markup language, and, if the function produces a result, defining (E10) a third tag describing the result of the function, this tag being contained in the first tag describing the function and the type of the result being expressed in the second markup language.