*       Stream.map}).
 *   <li><b>Do not</b> call {@link #doForward} or {@link #doBackward} directly; these exist only to
 *       be overridden.
 * </ul>
 *
 * <h3>Example</h3>
 *
 * <pre>
 *   return new Converter&lt;Integer, String&gt;() {
 *     protected String doForward(Integer i) {
 *       return Integer.toHexString(i);
 *     }
 *
 *     protected Integer doBackward(String s) {
 *       return parseUnsignedInt(s, 16);

 * </td></tr>
 * 
 * <tr><td width="20%"><code>smb1://myworkgroup/angus/ &lt;-- ILLEGAL </code></td><td>
 * Despite the hierarchial relationship between workgroups, servers, and
 * filesystems this example is not valid.
 * </td></tr>
 *
 * <tr><td width="20%">
 * <code>smb1://server/share/path/to/dir &lt;-- ILLEGAL </code></td><td>

 * <td>
 * A prototypical example that uses all the fields.
 * </td>
 * </tr>
 *
 * <tr>
 * <td width="20%">
 * <code>smb://server/share/path/to/dir &lt;-- ILLEGAL </code></td>
 * <td>
 * URLs that represent servers, shares, or directories require a trailing slash '/'.
 * </td>
 * </tr>
 *
 * </table>
 * 
 * <p>