Returns the given Node attribute associated to the given column.

        :param node: Node.
        :type node: AbstractCompositeNode or GraphModelNode
        :param column: Column.
        :type column: int
        :return: Attribute.
        :rtype: Attribute

def get_attribute(self, node, column):
        """
        Returns the given Node attribute associated to the given column.

        :param node: Node.
        :type node: AbstractCompositeNode or GraphModelNode
        :param column: Column.
        :type column: int
        :return: Attribute.
        :rtype: Attribute
        """

        if column > 0 and column < len(self.__horizontal_headers):
            return node.get(self.__horizontal_headers[self.__horizontal_headers.keys()[column]], None)