Recognize tables from pdf

Hi I really enjoy working on PDFNet. ,you had posted that we can read
the table from pdf by using logical structure.But how could i identify
that the particular element is the content of table?

I am not completely clear regarding what you want to accomplish. It
seems that you would like to extract reading order of the page. In
this case pdftron.PDF.TextExtractor will give you the initial 'DOM'
and you can insert images into the 'DOM' using ElementReader (to
extract image location [element.GetBBox()] and image data
(ImageExtract sample)). Given that you have bounding box for all text
blocks and images you can insert references to images at the desired
location in the DOM.