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From Andreas L Delmelle <a_l.delme...@pandora.be>
Subject Re: widows and orphans on lists and tables
Date Thu, 10 Aug 2006 19:09:31 GMT
On Aug 10, 2006, at 17:47, Jeremias Maerki wrote:

> <snip />
> I could imagine properties like orphan-height and widow-height on
> fo:table and fo:list-block for that purpose.

That indeed sounds like a job for extension properties.

I have always wondered what would need to be done to implement an  
arbitrary extension property that has an impact on layout... IIC,  
there has been talk, way back when, about setting parameters for the  
Knuth algorithm through extension properties.

AFAICT, the foreign attribute is handled when the FO tree is built.  
If the namespace is registered as non-ignorable, then it is added to  
the FObj, and fully accessible. The framework is in place. Of course,  
we are at liberty to implement the use of those foreign attributes  
*in* the current table/list LMs, but what would someone have to do if  
he/she wants to make it a literal extension...?

Do we already provide an 'entry point' into the layout API that any  
code related to extension properties can use? If not, then this seems  
like a perfect opportunity to think about how it should look like.



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