# Link state ("signal")
# is optional: absent for yet-to-compute signals

intLink_signal:AttributeLink (intLink -> Integer) {
  name = "signal";
  optional = True;
}
boolLink_signal:AttributeLink (boolLink -> Boolean) {
  name = "signal";
  optional = True;
}
strLink_signal:AttributeLink (strLink -> String) {
  name = "signal";
  optional = True;
}



# Delay block state
# mandatory - otherwise we cannot determine the output signal of a delay block

State:Class {
  abstract = True;
}

delay2State:Association (Delay -> State) {
  source_lower_cardinality = 1;
  source_upper_cardinality = 1;
  target_lower_cardinality = 1;
  target_upper_cardinality = 1;
}

BoolState:Class
IntState:Class
StrState:Class

:Inheritance (BoolState -> State)
:Inheritance (IntState -> State)
:Inheritance (StrState -> State)


BoolState_state:AttributeLink (BoolState -> Boolean) {
  name = "state";
  optional = False;
}

IntState_state:AttributeLink (IntState -> Integer) {
  name = "state";
  optional = False;
}

StrState_state:AttributeLink (StrState -> String) {
  name = "state";
  optional = False;
}