Re: [docbook-apps] impotent "space-before.*" in attribute set component.title.properties

["Bob Stayton" <bobs@sagehill.net>]

Hi Erik,
You have run into a feature of XSL-FO.  The space-before property is 
purposely ignored at the top of a page unless it is also accompanied by

space-before.conditionality="retain"

That is because when a block element is bumped to the next page during 
pagination, its text will start at the top of the body area as you would 
expect, rather than pushed down by its space-before property.  In the case 
of a chapter title that you know starts at the top of a page and you want 
the space, you have to override that feature with this property.

Bob Stayton
Sagehill Enterprises
bobs@sagehill.net

--------------------------------------------------
From: "Erik Leunissen" <e.leunissen@hccnet.nl>
Sent: Saturday, October 05, 2013 10:20 AM
To: <docbook-apps@lists.oasis-open.org>
Subject: [docbook-apps] impotent "space-before.*" in attribute set 
component.title.properties

> I'm customizing the appearance of chapter titles using the attribute set 
> below in my customization layer.
>
> No matter to what extreme values I set the "space-before.*" attributes, 
> they don't make any difference at all in the fo output (PDF). This as 
> opposed to the "space-after.*" attributes, to which the output is 
> sensitive as expected.
>
> I'm clueless about what's going wrong: my logic, xsl or fop processing, 
> ...
>
> Any help in directing me where to look for something inappropriate is much 
> appreciated.
>
> Thanks in advance,
>
> Erik Leunissen.
> --
>
> Processing system
> -----------------
> docbook stylesheets version 1.78
> FOP Version 1.1
>
> Customization
> -------------
> <xsl:attribute-set name="component.title.properties">
>   <xsl:attribute name="font-size">
>     <xsl:value-of select="$body.font.master * 4.0"></xsl:value-of>
>     <xsl:text>pt</xsl:text>
>   </xsl:attribute>
>
>   <!-- The following lines don't have any effect at all -->
>   <xsl:attribute name="space-before.minimum">12.0em</xsl:attribute>
>   <xsl:attribute name="space-before.optimum">13.0em</xsl:attribute>
>   <xsl:attribute name="space-before.maximum">14.0em</xsl:attribute>
>
>   <!-- These do affect the output -->
>   <xsl:attribute name="space-after.minimum">2.5em</xsl:attribute>
>   <xsl:attribute name="space-after.optimum">3.0em</xsl:attribute>
>   <xsl:attribute name="space-after.maximum">3.5em</xsl:attribute>
> </xsl:attribute-set>
>
> -- end of message --
>
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