<scxml>
  <parallel id="P">
    <state id="A">
      <state id="A-start">
        <transition target="A-done" event="t"/>
      </state>
      <state id="A-done"/>
    </state>
    <state id="B">
      <state id="B-start">
        <transition target="B-done" event="t"/>
      </state>
      <state id="B-done"/>
    </state>
    <transition target="done" cond="In('A-done') && In('B-done')"/>
  </parallel>
  <state id="done"/>
</scxml>