[Okular-devel] Re: How to best express annotations

[Albert Astals Cid]

A Dijous, 4 de novembre de 2010, Albert Astals Cid va escriure:
> A Dijous, 4 de novembre de 2010, Jakob Voss va escriure:
> > Hi,
> > 
> > Apparently annotations are an issue that is still not resolved. You
> > should be able to read and modify annotations that were created by other
> > PDF readers, but poppler does not support it. There are also good
> > reasons to store annotations separated from the original document. But
> > each applications seems to have its own proprietary format to store and
> > exchange annotations. I summarized some notes here:
> > 
> > https://github.com/nichtich/marginalia/wiki/Support-of-PDF-annotations
> > 
> > It looks like Okular uses its own proprietary format to express
> > annotations in metadata.xml. Can you point me to any documentation of
> > this format? How does it compare to the format used by other
> > applications (Xournal, iAnnotate, Evernote etc.).
> > 
> > You could transform okular annotations to PDF annotations, and vice
> > versa. The iText PDF library seems to support reading and adding PDF
> > annotations. A simple sample script can be found at:
> > 
> > https://github.com/nichtich/marginalia
> > 
> > you should be able to get it running thanks to Maven, which makes
> > programming in Java suck at least less. But before programming a
> > converter for each custom annotation format - why not just using a
> > subset of XFDF? XFDF is known for storing PDF form data, but it also
> > supports PDF annotations in XML:
> > 
> > XML Forms Data Format Specification (XFDF) 2.0 (2007).
> > http://partners.adobe.com/public/developer/en/xml/xfdf_2.0.pdf
> > 
> > PDF annotations are defined in chapter 8.4 of the PDF reference (2006),
> > page 604-647. see
> > http://www.verypdf.com/document/pdf-format-reference/pg_0604.htm
> > 
> > Anyway, a standard file format for Annotations which can be extracted
> > from and added to PDF files, would be best.
> 
> We do know how to improve Annotation support in Okular, it's just that we
> do not have time for it.

Forgot to say that if you have time you are very welcome to help :-)

Albert

> 
> Albert
> 
> > Jakob
> 
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