re S = (structure TextIO : TEXT_IO))
	open TextIOComp</PRE>
	<P>The <TT>open</TT> declaration will pull the actual <TT>TextIO</TT>
	structure into scope.</P>
    </DD>

    <DT>
      <TT><A name="Enter-fn">Enter</A> (val url = <I>url</I>
	signature S = <I>S</I>
	structure X = <I>X</I>)</TT>
    </DT>
    <DD>
      <P>enters the module<TT><I>X</I></TT> of signature&nbsp;<TT><I>S</I></TT>
        as an evaluated component into the component
	table, under name <TT><I>url</I></TT>.  Raises <TT><A href="#Confl