, e n such that e 0 = start ( m 0 ), e i = end ( m j ), for some medium m j, and s i +1 = next ( s i, e i ) ∀ i = 0.ģ the set of states in which c 1, 2 is active, S r =, where s f = ∅, ∅, isUsed f, isUsed f ( c ) = ∀ c ∈ CH and there exists a path that leads to the final state that is an ordered sequence of events e 0, e 1. The ordered sequence of events might contain multiple instances of the same event end ( m j ), corresponding to different observable time instants. Let P be a naturally ending presentation and start ( m 0 ). end ( m k ) the sequence of labels of edges in the minimal path leading from the initial state s 0 to the final state s f. We call master objects of the presentation the media objects that appear in the labels of the edges of the given path whose timing makes the presentation evolve in its natural behavior.
By Definition 11, if a presentation naturally ends, we can recognize which are the master objects that make the presentation to evolve and which media items are played as a consequence of the progress of the presentation. Then, once the set of states in which the user is interested is retrieved, the master objects contained in them must belong to the fragment returned. Other media items may belong or not according to other considerations, as for example, the level of access given to the user, the resources available at the client side, and so on. As an example, in the result depicted in Fig. 4, c 1, 2 is the master object (as are its scenes sc 2, 1 and sc 2, 2 ) and must be returned to the user. Since the object tempo 1 is not directly related to the clip or to the scene, it can be omitted. The text comments text 2, 1 and text 2, 2 can be returned or not according to other information, like, e.g., the user preferences. Information retrieval in distributed multimedia documents requires modelling of the relationships among the media objects that build the presentations.
# %rwhois V-1.5 (rwhoisd 0.4.We have illustrated a synchronization model that takes a step further, with respect to other models defined in the literature, in considering also user actions among the events that drive the dynamics of a multimedia presentation.
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