W3C home > Mailing lists > Public > www-xsl-fo@w3.org > March 2003

RE: 7.16.2 "letter-spacing"

From: <David.Pawson@rnib.org.uk>
Date: Wed, 19 Mar 2003 15:37:31 -0000
Message-ID: <9B66BBD37D5DD411B8CE00508B69700F024A816C@pborolocal.rnib.org.uk>
To: pgrosso@arbortext.com, www-xsl-fo@w3.org

Paul said:
> The discussion at
> http://www.w3.org/TR/xsl/slice7.html#letter-spacing
> explains how letter-spacing affects the space-start and 
> space-end traits of the fo:character.
> What the spec doesn't make clear in section 7.16.2  is that letter-spacing
> only to the fo:character, fo:leader, and fo:page-number FOs 
> (as you discover if you search through the various FO descriptions
> for applicable properties).

I'm nearly happy with that Paul, but *which* character(s) is my question.
I'm using

> On any other FO, the value of letter-spacing is merely inherited 
> by the enclosed fo:character's (and leaders and page-numbers).  

So... (my terminology), is this 'reverse' inheritance? E.g. if I 
wrap my 3 fo:characters with an fo:block, the fo:block inherits
the letter spacing of the characters? 

> So to affect the letter-spacing on, say, an entire title, you 
> should put the letter-spacing property on the fo:block (or 
> whatever) that the title maps into, and this will be inherited 
> by the enclosed fo:characters.

I'd be happy with that. What I'm trying to do is use a negative
value to get a character to appear more to the start direction
than it normally would, rather than using a combining diaresis,
which works nicely to produce, say a u umlaut.

 <fo:block>Some standard inline text to test umlaut. </fo:block>
    <fo:block font-family="ArialUnicodeMS">   <fo:inline>This uses the
combining character value 0308, the diaresis.<fo:character
character="o"/><fo:character character="&#x0308;" 
/> </fo:inline></fo:block>

    <fo:block font-family="ArialUnicodeMS">
 <fo:inline>Some more standard inline text to test a different way.
&#x20;<fo:character character="A" letter-spacing="-0.8 * 1em" />
<fo:character character="&#x02DA;" 
vertical-align="50%"/> </fo:inline></fo:block>

The first block (I'm using the Microsoft Unicode font) works nicely.
The second, in trying to get a similar effect, is shown differently
in Antenna House and RenderX's XEP.

Equally, I can't figure out from the rec, and the two implementations,
what is supposed to occur. 

From what you say Paul, I don't think I'm suffering from inheritance issues,
hence I'm still not understanding what is supposed to be shifted,
when, say, the letter-spacing is set on the middle one of 3 fo:characters.

regards DaveP

> p.s.  Of course, not all processors support letter-spacing.


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Received on Wednesday, 19 March 2003 10:38:20 UTC

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