1. An encoding method for enabling a decoder to at least partially decode a structured document having a structure defined in at least a first schema not accessible to the decoder and resulting from a change of at least a second schema accessible to the decoder, a structured document comprising information elements nested in each other, the information elements of the document being associated in at least a first and a second schemas with respective element types each defining the respective element structures of the information elements, the first schema being not accessible to a decoder and the second schema being accessible to the decoder, the first schema defining at least one derived information element which is derived from a corresponding element defined in the second schema, the encoding method comprising the steps of: encoding the document using said first and second schemas into a binary stream comprising for each information elements of the document a binary sequence encoding the information element, and inserting in the binary sequence encoding the derived information element a reference designating the first schema in which the structure of the derived element is defined, said reference designating the first schema being defined in a schema reference list containing references to all schemas used for encoding the document, the schema reference list being made accessible to the decoder.