def attribute_changed(self, node, column):
        """
        Calls :meth:`QAbstractItemModel.dataChanged` with given Node attribute index.

        :param node: Node.
        :type node: AbstractCompositeNode or GraphModelNode
        :param column: Attribute column.
        :type column: int
        :return: Method success.
        :rtype: bool
        """

        index = self.get_attribute_index(node, column)
        if index is not None:
            self.dataChanged.emit(index, index)
            return True
        else:
            return False
Calls :meth:`QAbstractItemModel.dataChanged` with given Node attribute index.

        :param node: Node.
        :type node: AbstractCompositeNode or GraphModelNode
        :param column: Attribute column.
        :type column: int
        :return: Method success.
        :rtype: bool