gy.conformance">Conformance</a>
          </h6>
<p>
            The function covered_by is not defined by OGC.
          </p>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../../../doc/src/images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
              Both PostGIS and Oracle contain an algorithm with the same name and
              the same functionality. See t