an Entity references as follows:
Scope note: This property identifies an E52 Time-Span using an E49Time Appellation. Examples: - the time span 1926 to 1988 (E52) is identified by "Showa" (Japanese time appellation) (E49) In First Order Logic: P78(x,y) ⊃ E52(x) P78(x,y) ⊃ E49(y) P78(x,y) ⊃ P1(x,y)