betaJuliet ::= Event {";" Event} ".".
Event      ::= "event" Name {"," Property}.
Property   ::= "caused" TimePrep Name {WhenTerm}
             | "causes" Name ["immediately"] {WhenTerm}
             | "duration" Number TimeUnit.
TimePrep   ::= "before" | "after" | "by".
TimeUnit   ::= "ms" | "s" | "m" | "h" | "d".
WhenTerm   ::= "when" Name ">" Name.