 entry for <TT><I>url</I
	></TT>.</P>
    </DD>

    <DT>
      <TT><A name="lookup">lookup</A> <I>url</I></TT>
    </DT>
    <DD>
      <P>returns <TT>SOME <I>com</I></TT>, if the component table has
	an entry mapping <TT><I>url</I></TT> to <TT><I>com</I></TT>, or
	<TT>NONE</TT> otherwise.</P>
    </DD>

    <DT>
      <TT><A name="Eval-fn">Eval</A> (val component = <I>com</I>
	val url = <I>url</I>
	signature S = <I>S</I>)</TT>
    </DT>
    <DD>
      <P>like the function <TT><A href="#eval">eval</A></TT>