ith marks.
      A few "marks" can also appear in <code class="classname"><a href="ch04s03.html#class.timesig">TIMESIG</a></code> and 
      <code class="classname"><a href="ch04s02.html#class.part">PART</a></code> objects, but are called properties--for these, the syntax is exactly the same.
    </p><p>
      Two types of marks exist:
      </p><div class="itemizedlist"><ul type="disc"><li><p>
	  Simple marks that apply only to the <code class="classname"><a href="ch04s06.html#class.note">NOTE</a></code>,
