Parses <DataDisplay>

        @param node: Node containing the <DataDisplay> element
        @type node: xml.etree.Element

def parse_data_display(self, node):
        """
        Parses <DataDisplay>

        @param node: Node containing the <DataDisplay> element
        @type node: xml.etree.Element
        """

        if 'title' in node.lattrib:
            title = node.lattrib['title']
        else:
            self.raise_error('<DataDisplay> must have a title.')

        if 'dataregion' in node.lattrib:
            data_region = node.lattrib['dataregion']
        else:
            data_region = None

        self.current_simulation.add_data_display(DataDisplay(title, data_region))