  Multimedia scenarios have multimedia content and interactive events
associated with computer programs. Interactive Scores (IS) is a formalism to
represent such scenarios by temporal objects, temporal relations (TRs) and
interactive events. IS describe TRs, but IS cannot represent TRs together with
conditional branching. We propose a model for conditional branching timed IS in
the Non-deterministic Timed Concurrent Constraint (ntcc) calculus. We ran a
prototype of our model in Ntccrt (a real-time capable interpreter for ntcc) and
the response time was acceptable for real-time interaction. An advantage of
ntcc over Max/MSP or Petri Nets is that conditions and global constraints are
represented declaratively.
