Parses <DataWriter>

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

def parse_data_writer(self, node):
        """
        Parses <DataWriter>

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

        if 'path' in node.lattrib:
            path = node.lattrib['path']
        else:
            self.raise_error('<DataWriter> must specify a path.')

        if 'filename' in node.lattrib:
            file_path = node.lattrib['filename']
        else:
            self.raise_error("Data writer for '{0}' must specify a filename.",
                             path)

        self.current_simulation.add_data_writer(DataWriter(path, file_path))