In order to address this deficiency, we propose uSMIL -an extension of SMIL that allows the creation of non-decomposable stream bundles with an all or nothing playout semantics.  ...  Technical advances in networks, operating systems and web based services are enabling new web-based services such as audiovisual surveillance, monitoring and recording of unfolding real world scenes.  ...  If possible, that would lead to the creation of non-decomposable bundles of multimedia streams, which is the subject matter of our current investigation -of which we present some preliminary results.  ...