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Program Map Tables, or PMTs, contain information about programs. For éach program, there is a PMT, with the PMT for éach program appéaring on its own PID. The PMTs describe which PIDs contain data relevant to the program. PMTs also provide metadata about the stréams in their constituent PIDs. For example, if a program contains an MPEG-2 vidéo stréam, the PMT will list this PID, describe it as a vidéo stréam, and provide the type of vidéo that it contains (in this case, MPEG-2). The PMT may also contain additional descriptors providing data about its constituent stréams.