<pre>
class Monitor

InputReal x;  // plant output
OutputBoolean y;

Boolean z;
initial equation
y = false;
equation
z = (time > 0) and ( ((x >= 0) and (x <= 5))  or ((x >= 10) and (x <= 15)) );
algorithm
when edge(z) then
y := true;
end when;
end Monitor;
</pre>