Q: I'm working on a semantic engine and I'd like to introduce a
PDFdocument manager able to recognize the tables in a pdf document.
Is PDFNet library currently able to extract these information?
Otherwise, is it possible to extract spatial information about words,
images and graphical shapes?
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A: You can use PDFNet SDK (www.pdftron.com/net) to extract any
information from PDF documents (including text, images, positioning
information, graphics state attributes, etc).
As a starting point for your project you may want to take a look at
the following samples:
ElementReader: http://www.pdftron.com/net/samplecode.html#ElementReader
ElementReaderAdv: http://www.pdftron.com/net/samplecode.html#ElementReaderAdv
TextExtract: http://www.pdftron.com/net/samplecode.html#TextExtract
For PDF documents that contain logical structure (i.e. explicit
semantic information) you can also use a high-level logical structure
API: see LogicalStructure (http://www.pdftron.com/net/
samplecode.html#LogicalStructure).