pdf editors

[Philippe Landau]

Paul Sladen wrote:
> It's not astonishing that OpenOffice.org can't edit them.  (At least to me!)
> 
> PDF is an encapulsation format and as such the only thing that can really
> 'edit' a PDF file is a PDF editor---The tools that do so most effectively,
> Adobe's Illustrator, InDesign and Acrobat systems are basically PDF engines.
> 
> KWord from the KDE Office suite does have some support for importing PDF
> (that is, attempting to convert a PDF into an approximately equivalent Kword
> document).  The import plugin is based on a hacked-up Xpdf and worked by
> effectively drawing into the document anything that would have been rendered
> to the screen if the PDF file were being drawn for display.
> 
> There is a major difference between being able to import from PDF, export to
> PDF and actually being able to full-circle a PDF to the extend that can be
> described as 'editing'.
> 
> pdflatex (again based on the Xpdf backend) is probably the most advanced
> tool currently available to dealing with PDFs---although it's mainly a case
> of being able to perform imposition and combining pages from multiple PDF
> files into a larger resultant document.

so pdf encapsulates vector graphic images and text ?
does it also encapsulate postscript files too ?
is there a need for an open vector graphics format ?
is djvu an alternative to pdf ?

kind regards     philippe