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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* @copyright Copyright (c) 2006 - 2009 PHPExcel (http://www.codeplex.com/PHPExcel)
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
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* @version 1.7.0, 2009-08-10
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* PHPExcel_IComparable
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* @copyright Copyright (c) 2006 - 2009 PHPExcel (http://www.codeplex.com/PHPExcel)
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interface PHPExcel_IComparable
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* @return string Hash code
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public function getHashCode();
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* Note that this index may vary during script execution! Only reliable moment is
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* while doing a write of a workbook and when changes are not allowed.
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* @return string Hash index
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public function getHashIndex();
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* Note that this index may vary during script execution! Only reliable moment is
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* while doing a write of a workbook and when changes are not allowed.
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* @param string $value Hash index
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public function setHashIndex($value);