| http://www.w3.org/ns/prov#value | - He may conduct such investigations by taking oral evidence of reputed witnesses and for this purpose may, by subpoena or subpoena duces tecum, summon witnesses to appear and testify under oath before him, or to produce documents and other evidence before him, and the attendance of, or the production of documents and other evidence by an absent or recalcitrant witness may be enforced by application
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