| http://www.w3.org/ns/prov#value | - It is preferred that the number of appearance of an event set pair <X,Y> or an event pair <ex,ey > of a first event set X (={ex1,ex2, . . . ,exn, . . . }, exn indicates an event and n is a natural number) or a first event ex occurred at a time ti (i is an integer equal to or more than 0) and a second event set Y (={ey1,ey2, . . . ,eyn, . . . }, eyn indicates an event) or a second event ey occurred
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