Hi Jeremias,
thanks for the pointers!
The bigger picture of such an use case would be to have a more
interactive way of xsl fo generation. In automated publishing there's
always the big question of to what extend the users needs to interact
with/modify the output.
Right now there's only black and white. Generate PDF directly or
generate something that is editable (e.g. InDesign or Word etc.). Since
Word is not my first choice (for anything) and InDesign is quite a
complex beast, I'd find it most desirable to have a toolset that let's
the user define the contents he/she wants to publish and get immediate
feedback about the output- while still being able to change various
things concerning output/layout.
The intermediate format seems to be as close as you can get but the area
tree xml would need to be transformed to more abstract information e.g.
chapter XY starts on a left page (334). Then the user could decide to
insert a blank page or custom page (maybe an advertisement) to push the
chapter start on the next page and fill the empty space etc.
I know a lot of this already possible by defining it in XSL-FO but not
everything can be predefined...
Regards,
Max
Jeremias Maerki schrieb:
If "prod-id" in the area tree works for you (as suggested by Georg),
that's fine. However, that doesn't give you the absolute position of the
element on the page. You can calculate that position from the various
attributes if you can figure it out. But that's quite tricky and
undocumented. Usually, that's the renderers' job and encoded in their
source code. So you'd be building half a renderer just for that.
The new intermediate format [1] I'm working [2] on uses a system more
like SVG (absolute coordinates plus nested transformation matrices)
where it's pretty easy to calculate the absolute position on the page.
But there's no support, yet, for identifying an element from the FO. We
may add that later.
At any rate, if you want to pass through custom attributes, that's
pretty easy for most FO elements: Just specify your own attributes in a
non-FO namespace. You may have to let FOP know about that namespace
using FopFactory.ignoreNamespace(String). Alternatively, register an
ElementMapping object with FOP. These extension attributes should make
it to the area tree XML and to a certain degree also into the new
intermediate format.
Anyway, before you go down such a road, I'd re-verify that you can't
implement that requirement using plain XSL-FO.
[1] http://wiki.apache.org/xmlgraphics-fop/AreaTreeIntermediateXml/NewDesign
[2]
http://svn.apache.org/repos/asf/xmlgraphics/fop/branches/Temp_AreaTreeNewDesign
On 12.01.2009 11:33:43 Maximilian Gaerber wrote:
Hi,
is there an (easy) way to add custom attributes to a FO document that
would be preserved through the whole FOP process?
The idea is to get feedback about on what page (and position) a certain
block or other other content *would* come out in the output format (e.g.
PDF): Let's say I've got a block that should always be displayed on the
first half of the page. Now, when I generate, I'd have to search for
this block in the area tree in order to determine it's position... but
so far I don't know how to mark/identify such a block.
Jeremias Maerki
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