<send> expressions in example G.1

Example G.1's Main.scxml has the following (excerpted):

    <state id="Test3Sub1">
      <onentry>
        ...
        <send event="'Timer'"  delay="'5s'"/>
      </onentry>
      ...
    </state>

It seems to me that the values of both the "event" and "delay" attributes above should be unquoted. The quotes seem appropriate if these were eventexpr="..." and delayexpr="...", but not for the non-expression flavors.