Hi Tony,

Thanks for the advice. I have already started to look at the OpenType 
standard, in particular the parts describing the various baselines. 
Unfortunately I don't suppose I'll be attending the Unicode conference 
but perhaps someone here will be and could listen to Steve's talk and 
could report back to the group.

However, it seems clear that FOP will definitely need to enhance the 
information it is managing about Fonts in order to provide the baseline 
information needed to implement these aspects of the spec.


Tony Graham wrote:

> Karen Lease wrote at 20 Aug 2002 23:07:46 +0200:
>  > That would be good. I haven't looked at it for a month or so, but I had 
>  > (as usual) some questions about various statements in the XSL-FO spec 
>  > concerning the interpretation of the various properties. Perhaps we 
>  > could go over those issues at some point.
> ....
>  > Arved Sandstrom wrote:
>  > 
>  > >>-----Original Message-----
>  > >>From: Karen Lease [mailto:[EMAIL PROTECTED]]
> ....
>  > >>With regard to the line-height calculations, is anybody in the group
>  > >>interested in getting into the gory details of the baseline stuff for
>  > >>different scripts? I spent some time poring over the spec and trying to
>  > >>get a handle on this, but maybe it's too much detail for now. On the
>  > >>other hand, I'd really like to make sure that this version of FOP
>  > >>handles that stuff correctly as well as being able to do the various
>  > >>kinds of line-stacking strategies defined by the XSL-FO spec.
>  > >>
>  > > 
>  > > I am definitely interested. I have put some thought into these things
>  > > already. Granted, when I implement it'll be a different codebase but I am
>  > > happy to work out the details on this list.
> You may be interested in Steve Zilles's statement in the abstract [1]
> for his talk at next month's Unicode Conference where he says:
>    The extended CSS/XSL model is based on the Open Type font
>    model. This model posits a set of alignment baselines for different
>    scripts, e.g., alphabetic, ideographic and hanging scripts. This
>    allows characters in a given script, but presented in different
>    font sizes, to be aligned on the baseline natural to that script.
> I just looked in the XSL Recommendation, and Section 7.8.1 notes:
>    XSL uses an abstract model of a font. This model is described in
>    this section and is based on current font technology as exemplified
>    by the OpenType specification [OpenType].
> Maybe you also need to look at the OpenType spec.
> Regards,
> Tony Graham
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> [1] http://www.unicode.org/iuc/iuc22/a365.html
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