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From Andreas Delmelle <andreas.delme...@telenet.be>
Subject Re: AW: Index and Pagenumbers
Date Wed, 04 Mar 2009 21:45:30 GMT

On 04 Mar 2009, at 19:39, Andreas Delmelle wrote:


> On 04 Mar 2009, at 14:56, Georg Datterl wrote:
> <snip />
> I once started gathering some thoughts on the topic, but didn't get  
> very far...
> See: http://wiki.apache.org/xmlgraphics-fop/FormattingObjectsForIndexing

Re-reading this and the original question:
If we would have fo:index-page-citation-list, fo:index-key-reference  
and the index-key/ref-index-key property pair, the solution would be  
fairly simple.
Adapt the stylesheet to append the node's id to the index-key  
attribute, so that we get an index-key that maps 1-on-1 to the id. A  
basic index-page-citation-list is all that is needed to produce  
sequences without duplicates.
Merging sequential page-numbers is already a nice-to-have. By itself,  
once the basic mechanism proves to be working, this should become easy.
The priority after basic implementation (2 objects + 2 properties)  
should probably go to implementing different separator-sequences.  
(NTS: may need to adapt that order on the Wiki). I consider it to be  
on the same level as index-ranges in terms of complexity, but  
different separators suddenly look more useful...

> By itself, the implementation of the 'index-key' property is not  
> that difficult. It is its treatment further on during layout/ 
> rendering that will be a challenge.

As Jeremias hinted, especially layout/rendering.
We will get a LayoutManager whose content can be partly or entirely  
unresolved (like the PageNumberCitationLM), and can grow significantly  
in case of large documents. Sometimes reaching one or more lines. This  
could mean that the layout for all the following pages may need to be  
revisited, which is something FOP is currently not equipped to do...

It would be easy enough to have such a LayoutManager merge a sequence  
of citations into one, keeping track of and eliminating duplicates,  
but the possible side-effects of a mix of resolved and unresolved  
elements, without somehow redoing the layout, cannot be so easily  
avoided in the current design.



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