code: function OpenDoc_ChartInit() {
  
  		$this->OpenDocCharts = array();
  
  		$idx = $this->Ext_GetMainIdx();
  		$Txt = $this->TbsStoreGet($idx, 'OpenDoc_ChartInit');
  
  		$p = 0;
  		while($drEl = clsTbsXmlLoc::FindElement($Txt, 'draw:frame', $p)) {
  
  			$src = $drEl->GetInnerSrc();
  			$objEl = clsTbsXmlLoc::FindStartTag($src, 'draw:object', 0);
  
  			if ($objEl) { // Picture have <draw:frame> without <draw:object>
  				$href = $objEl->GetAttLazy('xlink:href'); // example "./Object 1"
  				if ($href) {
  
  					$imgEl = clsTbsXmlLoc::FindElement($src, 'draw:image', 0);
  					$img_href = ($imgEl) ? $imgEl->GetAttLazy('xlink:href') : false; // "./ObjectReplacements/Object 1"
  					$img_src = ($imgEl) ? $imgEl->GetSrc('xlink:href') : false;
  
  					$titEl = clsTbsXmlLoc::FindElement($src, 'svg:title', 0);
  					$title = ($titEl) ? $titEl->GetInnerSrc() : '';
  
  					if (substr($href,0,2)=='./') $href = substr($href, 2);
  					if ( is_string($img_href) && (substr($img_href,0,2)=='./') ) $img_href = substr($img_href, 2);
  					$this->OpenDocCharts[] = array('href'=>$href, 'title'=>$title, 'img_href'=>$img_href, 'img_src'=>$img_src, 'to_clear'=> ($img_href!==false) );
  
  				}
  			}
  			$p = $drEl->PosEnd;
  		}
  
  		
  	}
docs: Look for all chart in the document, and store information.