| http://www.w3.org/ns/prov#value | - As shown in FIG. 17, the retrieval key attribute database 17-2 stores the attribute values of the attribute items for all 350 concert performers, such as the concert date, the day of the week of the concert, the place of the concert, the prefecture in which the place of the concert is located, and the style of music to be played in the concert.
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