code: public static <K,V> Level0MapOperator<Map<K,V>,K,V> onMap(final Map<K,V> target) {
          return new Level0MapOperator<Map<K,V>,K,V>(ExecutionTarget.forOp(target, Normalisation.MAP));
      }
docs: <p>
  Creates an <i>operation expression</i> on the specified target object.
  </p>
  
  @param target the target object on which the expression will execute
  @return an operator, ready for chaining