xsd:string A Phenomenon, which may be an activity, state or object, is purposefully hidden from the awareness of a potential Cognizer. The person responsible for the hiding of the Phenomenon is not part of this frame and cannot be syntactically realized. The potential Cognizer may be realized, but is in fact rarely expressed. A period of Time during which the Phenomenon is secret may be indicated. Few people would use ATMs if the content of their transaction was secret from their bank and there was no paper trail verifying the transaction. . The protesters were not on her list, and weren't allowed in, despite the fact that the meeting was public. Student disciplinary matters are confidential and should only be discussed with appropriate university officials