Scope note: This property describes the active or passive presence of an E77 Persistent Item in an E5 Event without implying any specific role. It connects the history of a thing with the E53 Place and E50 Date of an event. For example, an object may be the desk, now in a museum on which a treaty was signed. The presence of an immaterial thing implies the presence of at least one of its carriers. Examples: - Deckchair 42 (E19) was present at The sinking of the Titanic (E5) In First Order Logic: P12(x,y) ⊃ E5(x) P12(x,y) ⊃ E77(y)