= !ScaleLine Control = 
 * Class Definition: [source:trunk/openlayers/lib/OpenLayers/Control/ScaleLine.js]
 * API Reference: 
 * Family Tree:
   * !OpenLayers.Control.!ScaleLine
     * [wiki:Control OpenLayers.Control]
 * Related Links: 
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Display a small line indicator representing the current map scale on the map.