| http://www.w3.org/ns/prov#value | - Any given one of the keywords contained in the keyword dictionary 2 is so structured as to have at least one link, including a link leading to a keyword representing an upper rank concept of the given keyword, a link to a keyword representing a lower rank concept and a link to a keyword having semantically same meaning (i.e. synonym) as the given keyword on the basis of the field or domain of the
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