| http://www.w3.org/ns/prov#value | - In some embodiments, an exit system may create and send an event message when, for example, the ticket acceptor 146 is full, a ticket is jammed in the ticket acceptor 146 or the ticket acceptor 146 has otherwise malfunctioned, a credit card or other object is jammed in the ticket accepter 146, an invalid card or ticket has been provided to the ticket acceptor 146, the gate 148 fails to open or clo
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