<pre>
class Monitor

InputReal x;  // plant output
OutputBoolean y;

Boolean z;

initial equation

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