generate dsl1DSL "http://www.dsl1DSL.dsl1"
DSL1:
   somecontent=STRING
   (otherDSLs+=OtherDSL)*;
OtherDSL:
   "OtherDSL" name=ID path=STRING;

generate dsl2DSL "http://www.dsl2DSL.dsl2"
DSL2:
   somecontent=STRING
   (methodcalls+=MethodCall)*;
MethodCall:
   "methos" returnValue=ID methodName=ID  params=STRING;

for (otherDSL : DSL1.otherDSLs) {
   Resource resource = new Resource(otherDSL.path);
   val dsl2 = resource.allContents.filter(typeof(DSL2)).head;
   for (methodcall : dsl2.methodCalls) {
     //use content here
   }
}

Statemachine:
	(name=Name)
	(states+=State)*
	(eventgroups+=EventGroups)*,
EventGroups:
	"EventGroup" name=ID file=STRING;
State:
   "state" name=ID;

Event:
	(interface+=Interface)	;

Interface:
	"interface" name=ID "{"
	(functions+=Function)*
	"}";

Function:
	returnVal=STRING methodName=STRING "(" params=STRING ")"";"
;

name "myStatemachine"

state "state1"

EventGroup event1 "../NeededEvents.event"

for (eventdsl : statemachine.eventGroups) {
   Resource resource = new Resource(eventdsl.file);
   val eventGroup = resource.allContents.filter(typeof(Event)).head;
   for (function : eventGroup.interface.functions) {
       //use content here
   }
}

import 'uri of your event dsl' as events

Statemachine:
	(name=Name)
	(states+=State)*
	('event' events+=[events:Event])*;