source: sourcecode/application/libraries/PHPExcel/Writer/Excel2007/RelsRibbon.php @ 1

<?php
/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2014 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
 * @version     1.8.0, 2014-03-02
 */


/**
 * PHPExcel_Writer_Excel2007_RelsRibbon
 *
 * @category   PHPExcel
 * @package    PHPExcel_Writer_Excel2007
 * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class PHPExcel_Writer_Excel2007_RelsRibbon extends PHPExcel_Writer_Excel2007_WriterPart
{
        /**
         * Write relationships for additional objects of custom UI (ribbon)
         *
         * @param       PHPExcel        $pPHPExcel
         * @return      string          XML Output
         * @throws      PHPExcel_Writer_Exception
         */
        public function writeRibbonRelationships(PHPExcel $pPHPExcel = null){
                // Create XML writer
                $objWriter = null;
                if ($this->getParentWriter()->getUseDiskCaching()) {
                        $objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
                } else {
                        $objWriter = new PHPExcel_Shared_XMLWriter(PHPExcel_Shared_XMLWriter::STORAGE_MEMORY);
                }

                // XML header
                $objWriter->startDocument('1.0','UTF-8','yes');

                // Relationships
                $objWriter->startElement('Relationships');
                $objWriter->writeAttribute('xmlns', 'http://schemas.openxmlformats.org/package/2006/relationships');
                $localRels=$pPHPExcel->getRibbonBinObjects('names');
                if(is_array($localRels)){
                        foreach($localRels as $aId=>$aTarget){
                                $objWriter->startElement('Relationship');
                                $objWriter->writeAttribute('Id', $aId);
                                $objWriter->writeAttribute('Type', 'http://schemas.openxmlformats.org/officeDocument/2006/relationships/image');
                                $objWriter->writeAttribute('Target', $aTarget);
                                $objWriter->endElement();//Relationship
                        }
                }
                $objWriter->endElement();//Relationships

                // Return
                return $objWriter->getData();

        }

}