tain the <code>Geometry</code>s in
  it.
 For example:<br>

  <ul>
    <li> If <code>geomList</code> contains a single <code>Polygon</code>,
    the <code>Polygon</code> is returned.
    <li> If <code>geomList</code> contains several <code>Polygon</code>s, a
    <code>MultiPolygon</code> is returned.
    <li> If <code>geomList</code> contains some <code>Polygon</code>s and
    some <code>LineString</code>s, a <code>GeometryCollection</code> is
    returned.
    <li> If <code>geomList</code> is empty, an emp