Abstract class used for creating documents

• version: 2.2
• copyright: Copyright (c) 2009-2011 Narcea Producciones Multimedia S.L. (http://www.2mdc.com)
• link: http://www.phpdocx.com
• since: File available since Release 2.2
• license: http://www.phpdocx.com/wp-content/themes/lightword/pro_license.php