PML: Adding flexibility to multimedia presentations

In multimedia systems, designers typically link content and presentation. A new markup language, Procedural Markup Language (PML), decouples content a nd presentation. It lets users specify the knowledge structures, underlying physical media, and relationships between them using cognitive media roles . This approach fosters modular system design and dynamic multimedia system s that can determine appropriate presentations for a given situation by all owing knowledge specification to be done separately from knowledge presenta tion.