Mon May 24 16:18:03 CEST 2004
On Fri, 21 May 2004 bry@REDACTED wrote:
> A propos the erlguten pdf stuff.
> One, have you(Joe and whoever else is on the
> project) considered doing xsl-fo support?
I considered it and then rejected the idea.
I wanted to go from XML markup -> PDF
in one step. This is in itself a difficult problem
adding yet another intermediate language make it even
I want ErlGuten to *create* the PDF and no other program - that wall
I'll get exactly what I want and nothing else.
If I transform to xsl-fo and then let some other program turn this
in PDF then I loose this control - and if things go wrong and I don't
get the results I want it will be *very* difficult to fix.
<< this is just a special case of Joe's theorem, namely, "If more
than 2 open source projects are combined into one project then you'll
spend all your time figuring out why the code in the different
projects is broken and zero time on the original problem >>
It turns out that PDF is pretty easy to produce (just read the 673
page PDF manual, oh and 890 pages of postscript and a few hundred
pages on fonts - thats all you need :-) - then you can do whatever you
want. My goal was to steer the placement of pixels on paper down to
single pixel resolution - this is pretty easy - I think going via
xsl-fo would just complicate matters.
> Two, if not maybe might want to look at
> http://pdml.sourceforge.net/ it struck me as
> an idea to base erlguten on pdml and then
> allow extensions to do more advanced stuff.
pdml is much simpler that erlGuten - so I guess I "easily " transform
pdml to ErlGuten and thence to PDF.
> Basically i was thinking that might be an
> idea given PDML being implemented in php,
> and YAWS support for php. one of the hotter
> areas for pdf generation being online print
> on demand generation.
What is Yaws support for php? - are we looking for volunteers to
write a php interpretor in erlang? << actually this would be great fun,
there is no reason to imagine that a php interpretor implemented in
Erlang would be slow. Anybody got a PHP yacc grammar? >>
 Easily is meant in the sense of - "I haven't written a program that
actually does this but it's probably not *impossibly* difficult."
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