1. Method for a description of audio-visual data content in a multimedia environment comprising: a binary identifier (BID) for each specified descriptor (D) and description scheme (DS) contained in a known dictionary, which descriptor (D) is a representation of a feature for a distinctive characteristic of data and which description scheme (DS) specifies the structure and semantics of the relationships between its components, being descriptors (D) and/or description schemes (DS), a binary description definition language (DDL).