| http://www.w3.org/ns/prov#value | - Then, in this state, the operator can designate an image-sound material to be retrieved by inputting all or some of the material ID of a desired image-sound material, a version number of a desired version when the image-sound material has been modified several times, the title, a category such as sports or news to which the image-sound material belongs, a file type of the image-sound material such
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