One of the key aspects of any mobile multimedia application is the management of multimedia documents. Currently, multimedia documents can be displayed on multiple platforms (laptops, smartphones, tablets, etc.) that result in a birth of new information system called pervasive. The various execution contexts of a multimedia presentation introduce different constraints for the presentation itself. This includes device constraints and user preferences, resulting to the overall system heterogeneity increase. In this paper, we propose a specific ontology for on-the-fly (at runtime) adaptation of multimedia documents. Thus, we propose rules allowing automatic generation of dynamic and quality assembly of heterogeneous components. The proposed ontology has the great advantage to offer a flexible infrastructure to users to easily govern the response time and the quality assembly of their own applications at runtime.