RL string (that is,
 the "schemepart", as per RFC 1738) is used by that Store
 in a protocol dependent manner to locate and instantiate the
 appropriate Folder object. <p>

 Note that RFC 1738 also specifies the syntax for the 
 "schemepart" for IP-based protocols (IMAP4, POP3, etc.).
 Providers of IP-based mail Stores should implement that
 syntax for referring to Folders. <p></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>url</code> - URLName that represents the desired folder</