How to use the tablib.packages.openpyxl.shared.xmltools.end_tag function in tablib

start_tag(doc, 'worksheet',
                {'xml:space': 'preserve',
                'xmlns': 'http://schemas.openxmlformats.org/spreadsheetml/2006/main',
                'xmlns:r': 'http://schemas.openxmlformats.org/officeDocument/2006/relationships'})
        start_tag(doc, 'sheetPr')
        tag(doc, 'outlinePr',
                {'summaryBelow': '1',
                'summaryRight': '1'})
        end_tag(doc, 'sheetPr')
        tag(doc, 'dimension', {'ref': 'A1:%s' % (self.get_dimensions())})
        start_tag(doc, 'sheetViews')
        start_tag(doc, 'sheetView', {'workbookViewId': '0'})
        tag(doc, 'selection', {'activeCell': 'A1',
                'sqref': 'A1'})
        end_tag(doc, 'sheetView')
        end_tag(doc, 'sheetViews')
        tag(doc, 'sheetFormatPr', {'defaultRowHeight': '15'})
        start_tag(doc, 'sheetData')

hash(worksheet._styles[coordinate])]
            start_tag(doc, 'c', attributes)
            if value is None:
                tag(doc, 'v', body='')
            elif cell.data_type == cell.TYPE_STRING:
                tag(doc, 'v', body = '%s' % string_table[value])
            elif cell.data_type == cell.TYPE_FORMULA:
                tag(doc, 'f', body = '%s' % value[1:])
                tag(doc, 'v')
            elif cell.data_type == cell.TYPE_NUMERIC:
                tag(doc, 'v', body = '%s' % value)
            else:
                tag(doc, 'v', body = '%s' % value)
            end_tag(doc, 'c')
        end_tag(doc, 'row')
    end_tag(doc, 'sheetData')

def write_worksheet_hyperlinks(doc, worksheet):
    """Write worksheet hyperlinks to xml."""
    write_hyperlinks = False
    for cell in worksheet.get_cell_collection():
        if cell.hyperlink_rel_id is not None:
            write_hyperlinks = True
            break
    if write_hyperlinks:
        start_tag(doc, 'hyperlinks')
        for cell in worksheet.get_cell_collection():
            if cell.hyperlink_rel_id is not None:
                attrs = {'display': cell.hyperlink,
                        'ref': cell.get_coordinate(),
                        'r:id': cell.hyperlink_rel_id}
                tag(doc, 'hyperlink', attrs)
        end_tag(doc, 'hyperlinks')

cell = self._string_builder.add(cell)

            attributes['t'] = STYLES[dtype]['type']

            start_tag(doc, 'c', attributes)

            if dtype == 'formula':
                tag(doc, 'f', body = '%s' % cell[1:])
                tag(doc, 'v')
            else:
                tag(doc, 'v', body = '%s' % cell)

            end_tag(doc, 'c')


        end_tag(doc, 'row')

pane = 'bottomRight'
        paneAttrs.update(dict(topLeftCell=topLeftCell,
                              activePane=pane,
                              state='frozen'))
        tag(doc, 'pane', paneAttrs)
        selectionAttrs['pane'] = pane
        if row > 1 and column > 1:
            tag(doc, 'selection', {'pane': 'topRight'})
            tag(doc, 'selection', {'pane': 'bottomLeft'})

    selectionAttrs.update({'activeCell': worksheet.active_cell,
                           'sqref': worksheet.selected_cell})

    tag(doc, 'selection', selectionAttrs)
    end_tag(doc, 'sheetView')
    end_tag(doc, 'sheetViews')

def write_header(self):

        doc = self.header

        start_tag(doc, 'worksheet',
                {'xml:space': 'preserve',
                'xmlns': 'http://schemas.openxmlformats.org/spreadsheetml/2006/main',
                'xmlns:r': 'http://schemas.openxmlformats.org/officeDocument/2006/relationships'})
        start_tag(doc, 'sheetPr')
        tag(doc, 'outlinePr',
                {'summaryBelow': '1',
                'summaryRight': '1'})
        end_tag(doc, 'sheetPr')
        tag(doc, 'dimension', {'ref': 'A1:%s' % (self.get_dimensions())})
        start_tag(doc, 'sheetViews')
        start_tag(doc, 'sheetView', {'workbookViewId': '0'})
        tag(doc, 'selection', {'activeCell': 'A1',
                'sqref': 'A1'})
        end_tag(doc, 'sheetView')
        end_tag(doc, 'sheetViews')
        tag(doc, 'sheetFormatPr', {'defaultRowHeight': '15'})
        start_tag(doc, 'sheetData')

def write_worksheet(worksheet, string_table, style_table):
    """Write a worksheet to an xml file."""
    xml_file = StringIO()
    doc = XMLGenerator(xml_file, 'utf-8')
    start_tag(doc, 'worksheet',
            {'xml:space': 'preserve',
            'xmlns': 'http://schemas.openxmlformats.org/spreadsheetml/2006/main',
            'xmlns:r': 'http://schemas.openxmlformats.org/officeDocument/2006/relationships'})
    start_tag(doc, 'sheetPr')
    tag(doc, 'outlinePr',
            {'summaryBelow': '%d' % (worksheet.show_summary_below),
            'summaryRight': '%d' % (worksheet.show_summary_right)})
    end_tag(doc, 'sheetPr')
    tag(doc, 'dimension', {'ref': '%s' % worksheet.calculate_dimension()})
    write_worksheet_sheetviews(doc, worksheet)
    tag(doc, 'sheetFormatPr', {'defaultRowHeight': '15'})
    write_worksheet_cols(doc, worksheet)
    write_worksheet_data(doc, worksheet, string_table, style_table)
    if worksheet.auto_filter:
        tag(doc, 'autoFilter', {'ref': worksheet.auto_filter})
    write_worksheet_hyperlinks(doc, worksheet)
    if worksheet._charts:
        tag(doc, 'drawing', {'r:id':'rId1'})
    end_tag(doc, 'worksheet')
    doc.endDocument()
    xml_string = xml_file.getvalue()
    xml_file.close()
    return xml_string

if column > 1:
                pane = 'bottomRight'
        paneAttrs.update(dict(topLeftCell=topLeftCell,
                              activePane=pane,
                              state='frozen'))
        tag(doc, 'pane', paneAttrs)
        selectionAttrs['pane'] = pane
        if row > 1 and column > 1:
            tag(doc, 'selection', {'pane': 'topRight'})
            tag(doc, 'selection', {'pane': 'bottomLeft'})

    selectionAttrs.update({'activeCell': worksheet.active_cell,
                           'sqref': worksheet.selected_cell})

    tag(doc, 'selection', selectionAttrs)
    end_tag(doc, 'sheetView')
    end_tag(doc, 'sheetViews')

def _close_content(self):

        doc = self.doc
        end_tag(doc, 'sheetData')

        end_tag(doc, 'worksheet')
        #doc.endDocument()