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<postlude item>          ::= <postlude operation> [ <guard> ]
<guard>                  ::= if <BOOL EXPR>
                           | on final
<postlude operation>     ::= <postlude assignment>
                           | <postlude raise event>
                           | <binding>
<postlude assignment>    ::= ent:<ID> := <EXPR>
                           | clear ent:<ID>
<postlude raise event>   ::= raise <postlude event spec> [ for <STRING EXPR> ] [ attributes <MAP EXPR> ]
                           | last
<postlude event spec>    ::= <ID> event <STRING EXPR>
                           | event <STRING EXPR>