| http://www.w3.org/ns/prov#value | - A method according to claim 16, further comprising nodes of the following type:a table node arranged to receive an input stream of event data items and to store event data therefrom including said time of occurrence, the table node being responsive to being interrogated with a specified time, to return event data current at that time; a said cross-event processing node in the form of a table-refer
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