On May 11, 2007, at 3:21 PM, dayvidpow wrote:
> Is it REALLY that difficult to add Tagging to an existing PDF?
Was my email not clear enough about the description of what tagging
is? Did it not give you a clear indication of what is required? If
there was something in my description that wasn't clear to you,
please let me know what it is and I will be happy to go into more
detail.
> Let me explain
> again what I am attempting to do - I have an existing image-based PDF
> document into which I insert another page, hidden OCR text and
> bookmarks
> using the PdfStamper class, however I also want the final output to
> be a
> "Tagged" PDF file.
>
Since you have all the text that is being inserted, that makes it
easier - though still not trivial.
First, you will need to analyze the text in order to determine the
semantic nature of each piece of text. For example, where does each
paragraph start & end? Is a given string a Header or Footer? Is
any text contained inside of a table - and if so, what part of the
table? Once you have a semantic map for your data, you are ready to
proceed to step two. (This part is, of course, outside iText)
Second, as you add the text to the PDF you will need do the
following for each :"semantic block"
* Create an associated "Structure Element" inside of the
"Structure
Tree".
* Surround each set of operators with appropriate "marked
content"
operators that point to Structure elements you created.
I believe that iText APIs exist for some, but perhaps not all of the
above - in which case, you may need to extend iText itself.
Once you've done all of that, you can setup the global/document
level MarkInfo dictionary. Again, I am not sure if an API exists in
iText for this or not.
Leonard
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