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Re: reference-orientation

From: Peter B. West <lists@pbw.id.au>
Date: Thu, 17 Mar 2005 17:13:56 +1000
Message-ID: <42392E34.9070102@pbw.id.au>
To: Liam Quin <liam@w3.org>
CC: xsl-editors <xsl-editors@w3.org>

Liam Quin wrote:
> Peter,
> 
> Thank you for your comment.
> 
> You are correct about the intended behavior.
> 
> See for example 6.4.14 under Trait Derivation, which reads:
> 
>     [...] reference-orientation of the region-reference-area is set to
>     "0" and is, therefore, the same as the orientation established by
>     the region-viewport-area.
> 
> Your suggestion that it's not inherited seems a better approach,
> and the Working Group has accepted your comment.
> 
> Liam
> 
> on behalf of the XSL FO subgroup.

Liam,

Thanks for the positive response.  However, looking at this in the light 
of my latest comments on from-page-master-region() there seems to be a 
problem with my proposal.

If "normal" inheritance is removed, allowing only the inherit keyword, a 
reference-orientation specification on an FO which does not generate a 
reference-area can, in general, only be accessed by 
from-nearest-specified-value().  If this in thought to be undesirable, 
then it seems to me that a new inheritance category is required.  While 
this category is conceived for expressing reference-orientation, it can 
also be applied to writing-mode, and, if found necessary, clip and overflow.

If reference-area-scoped inheritance were available, it would function 
like normal inheritance, except that it's scope would be restricted to 
the range between the point of specification and the nearest 
descendant-or-self FO generating a reference-area. This would solve the 
problem of reference-orientation, and allow a reference-orientation to 
be expressed on any immediate ancestor-or-self of a reference-area 
(where "immediate" means that there is no other intervening reference-area.)

Peter
-- 
Peter B. West <http://cv.pbw.id.au/>
Folio <http://defoe.sourceforge.net/folio/> <http://folio.bkbits.net/>
Received on Thursday, 17 March 2005 07:14:02 GMT

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