| http://www.w3.org/ns/prov#value | - When the key is a word, it is also called a keyword.Key(n.)One of a set of small movable parts on an instrument or machine which, by being depressed, serves as the means of operating it; the complete set of keys is usually called the keyboard; as, the keys of a piano, an organ, an accordion, a computer keyboard, or of a typewriter.
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