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     <h4 class="title">
      <a name="gis-class-curve">
      </a>
      13.4.2.4 Curve Class
     </h4>
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  <p>
   A
   <code class="literal">
    Curve
   </code>
   is a one-dimensional geometry,
          usually represented by a sequence of points. Particular
          subclasses of
   <code class="literal">
    Curve
   </code>
   define the type of
          interpolation between points.
   <code class="literal">
    Curve
   </code>
   is a
          noninstantiable class.
  </p>
  <p>
   <span class="bold">
    <strong>
     <code class="literal">
      Curve
     </code>
     Properties
    </strong>
   </span>
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    <li class="listitem">
     <p>
      A
      <code class="literal">
       Curve
      </code>
      has the coordinates of its
              points.
     </p>
    </li>
    <li class="listitem">
     <p>
      A
      <code class="literal">
       Curve
      </code>
      is defined as a one-dimensional
              geometry.
     </p>
    </li>
    <li class="listitem">
     <p>
      A
      <code class="literal">
       Curve
      </code>
      is simple if it does not pass
              through the same point twice, with the exception that a
              curve can still be simple if the start and end points are
              the same.
     </p>
    </li>
    <li class="listitem">
     <p>
      A
      <code class="literal">
       Curve
      </code>
      is closed if its start point is
              equal to its endpoint.
     </p>
    </li>
    <li class="listitem">
     <p>
      The boundary of a closed
      <code class="literal">
       Curve
      </code>
      is
              empty.
     </p>
    </li>
    <li class="listitem">
     <p>
      The boundary of a nonclosed
      <code class="literal">
       Curve
      </code>
      consists of its two endpoints.
     </p>
    </li>
    <li class="listitem">
     <p>
      A
      <code class="literal">
       Curve
      </code>
      that is simple and closed is a
      <code class="literal">
       LinearRing
      </code>
      .
     </p>
    </li>
   </ul>
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