| http://www.w3.org/ns/prov#value | - Here, the retrieval keys may include, for example, a keyword, the registering metadata describing the features of the content and the additional information, a file format of images, sounds and other data included in the content, resolution, a file size and so on. [0054] When the retrieval demanding signal and the retrieval keys are input, the content retrieving section 10 matches the retrieval ke
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