function &getClone()
 {
     $clone =& parent::getClone();
     $clone->_has_presentation_file = $this->_has_presentation_file;
     $clone->_has_preview = $this->_has_preview;
     return $clone;
 }
 function &getClone()
 {
     $clone =& parent::getClone();
     $clone->_has_model_data = $this->_has_model_data;
     $clone->_has_preview = $this->_has_preview;
     return $clone;
 }
 function &getClone()
 {
     $clone =& parent::getClone();
     $clone->_has_conference_file = $this->_has_conference_file;
     $clone->_has_conference_paper = $this->_has_conference_paper;
     return $clone;
 }
 function &getClone()
 {
     $clone =& parent::getClone();
     $clone->_has_url_banner_file = $this->_has_url_banner_file;
     return $clone;
 }
 function &getClone()
 {
     $clone =& parent::getClone();
     $clone->_has_book_pdf = $this->_has_book_pdf;
     return $clone;
 }
 function &getClone()
 {
     $clone =& parent::getClone();
     $clone->_has_paper_pdf_reprint = $this->_has_paper_pdf_reprint;
     return $clone;
 }
 function &getClone()
 {
     $clone =& parent::getClone();
     $clone->_has_memo_file = $this->_has_memo_file;
     return $clone;
 }