docs: def areObservableElements(self, elementNames):
          """
          Mention if all elements are observable element.
  
          :param str ElementName: the element name to evaluate
          :return: true if is an observable element, otherwise false.
          :rtype: bool
          """
          if not(hasattr(elementNames, "__len__")):
              raise TypeError(
                  "Element name should be a array of strings." +
                  "I receive this {0}"
                  .format(elementNames))
  
          return self._evaluateArray(elementNames)