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I am able to identify the table type blocks. But how can I make them group and export them? 

I am using JAVA API. 

IFRDocument document = engine.CreateFRDocument();

try {

// Add image file to document

displayMessage( "Loading image..." );

    IRegionsCollection reg=engine.CreateRegionsCollection();

document.AddImageFile( imagePath, null, null );

IFRPages pages=document.getPages();

IRegion region=engine.CreateRegion();

System.out.println(pages.getCount());

if (pages != null && pages.getCount() > 0)

{

for(int i=0; i<pages.getCount();i++)

  {   IFRPage page=pages.Item(i);

   ILayout lay_out= page.getLayout();

   System.out.println(page.getLayout());

   ILayoutBlocks blocks=lay_out.getBlocks();

   System.out.println(lay_out.getBlocks());

   System.out.println(document.getPages().Item(i).getLayout().getBlocks().getCount());

   document.getPages().Item(i).getLayout().getBlocks().DeleteAll();

   int c=0;

   System.out.println(blocks.getCount());

   if(blocks != null && blocks.getCount()>0)

   {

    for(int j=0;i<blocks.getCount();j++)

    { IBlock block=blocks.Item(j);

    System.out.println(block.getType());

      if(block.getType()==BlockTypeEnum.BT_Table)

      {System.out.println(c);

      ITableBlock tblock=block.GetAsTableBlock();

       region=block.getRegion();

   document.getPages().Item(i).getLayout().getBlocks().AddNew(block.getType(),region,c);

       c++;

       }

     }

     }

   }

   }

//document.ProcessPages(null,null,reg);

document.Recognize(null,null);

document.Synthesize(null);

String texExportPath = SamplesConfig.GetSamplesFolder() + "images/Emely_11111.xls";

document.Export( texExportPath, FileExportFormatEnum.FEF_XLSX, null);

}