Re: Overlapping page regions

This issue came up a while back on the FOP team [1] when we were trying 
to figure out which region(s) (xsl-region-body or the side regions) 
should take precedence in the case of overlap.

If I may extend Ken's question into a suggestion for the 1.1 spec, if 
overlapping regions have a useful application (I'm unsure of any at the 
moment), it would probably be beneficial to define which region takes 
precendence, or perhaps better, to extend the "precedence" property to 
xsl-region-body for the user to define the "winning" region.

Otherwise, if overlapping regions should be considered a (recoverable) 
stylesheet error, then to add this to the specification instead.  In 
this case, how to recover from this error (e.g., always giving a certain 
region precedence), can probably be kept XSL processor-dependent.

Thanks,
Glen

[1] http://marc.theaimsgroup.com/?l=fop-dev&m=106330582719719&w=2



G. Ken Holman wrote:

>
> Hi folks!
>
> Reviewing XSL 1.0 6.4.13, in particular the second note, I note no 
> restrictions on the overlapping of the body region with perimeter 
> regions.
>
> Is it considered bad form to do so?  I have a particular situation 
> where I wish to overlap a paginated flow on top and in the middle of a 
> detailed static background.  I am not getting any error messages with 
> two engines I'm using, and I cannot see any restrictions in the spec 
> to prevent me from doing so.  The extent of my region-before runs to 
> the bottom of the page providing the background upon which I flow my 
> content in the overlapping region-body.
>
> The nature of my question today is, is this intentional in the 
> specification to allow the regions to overlap, or is it a byproduct of 
> the way the specification was written?  Can I rely on no errors to be 
> produced by a conforming engine?
>
> Thanks!
>
> ......................... Ken
>
> -- 
> Public courses: Spring 2004 world tour of hands-on XSL instruction
> Each week:   Monday-Wednesday: XSLT/XPath; Thursday-Friday: XSL-FO
>
> Hong Kong May 17-21;    Bremen May 24-28;    Birmingham June 14-18
>
> World-wide on-site corporate, govt. & user group XML/XSL training.
> G. Ken Holman                 mailto:[email protected]
> Crane Softwrights Ltd.          http://www.CraneSoftwrights.com/m/
> Box 266, Kars, Ontario CANADA K0A-2E0    +1(613)489-0999 (F:-0995)
> Male Breast Cancer Awareness  http://www.CraneSoftwrights.com/m/bc
> Legal business disclaimers:  http://www.CraneSoftwrights.com/legal
>