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with <var> = <expr> [[and] <var> = <expr>]* 

Any variable in a modifier clause is used (with its associated value) as an event parameter.  

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raise explicit event "foo"
  with a = "hello"
     and  b = 4 + x;

making the example
raise explicit event "foo"
 with a = "hello"
 b = 4 + x

Attributes Clause

The attributes clause also allows the developer to add event attributes to the event. The expression that follows the attributes key word must evaluate to a map. The keys and values in the map will be used as event attributes. This is particularly useful when you want to pass through all, or most, of the attributes that the current rule received:

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raise explicit event "foo"
  with a = "hello"
      and b = 4 + x
      and _api = "sky";

Like any other postlude statement, explicit events can be guarded:

raise explicit event "foo"
  with a = "hello"
   and    b = 4 + x
 if (flipper == "two");

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