| http://www.w3.org/ns/prov#value | - FIG. 2A is a schematic diagram illustrating a natural flow of the user's play list, which is a sequence of songs pre-selected by the user via the graphical user interface 110 supported by the client application 109 in FIG. 1A and FIG. 1B. Upon the user's command to play his play list, the client application 109 first checks whether there is a file characterized as the first song (S_1) of the play
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