sage)<br>
&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Pervasives</span>.result<br>
&nbsp;&nbsp;<span class="keyword">type</span>&nbsp;map&nbsp;=&nbsp;<span class="constructor">Build_path_prefix_map</span>.pair&nbsp;option&nbsp;list<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;encode_map&nbsp;:&nbsp;<span class="constructor">Build_path_prefix_map</span>.map&nbsp;<span class="keywordsign">-&gt;</span>&nbsp;string<br>
&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;decode_map&nbsp;:<br>
&nbsp;