SCCD/test_files/day_atlee/statechart_fig20_invar.xml

<?xml version="1.0" ?>
<statechart>
  <semantics
    big_step_maximality="take_many"/>

  <datamodel>
    a = 7;
    b = 2;
  </datamodel>

  <inport name="in">
    <event name="start"/>
  </inport>

  <outport name="out">
    <event name="done"/>
  </outport>

  <root initial="Invar">
    <parallel id="Invar">
      <state id="I1" initial="S1">
        <state id="S1">
          <transition target="../S2">
            <code> b = 2 * b; </code>
          </transition>
        </state>
        <state id="S2">
          <transition target="../S3">
            <code> b = 2 * a + b; </code>
          </transition>
        </state>
        <state id="S3"/>
      </state>

      <state id="I2" initial="S4">
        <state id="S4">
          <transition target="../S5">
            <code> a = a + b; </code>
          </transition>
        </state>
        <state id="S5">
          <transition target="../S6">
            <code> a = 3 * a; </code>
          </transition>
        </state>
        <state id="S6">
          <transition cond='@in("/Invar/I1/S3")' target="/Done"/>
        </state>
      </state>
    </parallel>

    <!-- this state is not in the example, but we introduce it to allow a final transition with output event the values of a and b -->
    <state id="Done">
      <onentry>
        <raise port="out" event="done">
          <param expr="a"/>
          <param expr="b"/>
        </raise>
      </onentry>
    </state>
  </root>
</statechart>