trigger_sync

trigger_sync 
      ::= 
      ( "before" | "after" ) 
      ( "delete" | "insert" | "update" [ "of" column_list ] ) 
      { "or" ( "delete" | "insert" | "update" [ "of" column_list ] ) } 
      "on" [ schema_name "." ] table_name 

This rule is call by

-> create_trigger