Making a poster about XSLT usage in xmlroff for XML Prague, the fun moment was replacing the uses of “xmlroff” with the xmlroff logo.
To do the deed, I added some XSL attributes to the <inline-graphic> element in my well-formed XML. I also made an entity declaration for &xmlroff; so I wouldn’t have to repeat the markup each time (and so, having got it right once, it would be right everywhere).
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE poster [ <!ENTITY xmlroff '<inline-graphic src="xmlroff.svg" alignment-adjust="-22.5%" height="from-parent('font-size')"/>' > ]> <poster> <title>Using XSLT in &xmlroff; for C Code Generation and XSL FO Testing</title> <body> <intro> <para>&xmlroff; (http://xmlroff.org) is a fast, free, high-quality,...
where:
height="from-parent('font-size')"sets the graphic height to the current font-sizealignment-adjust="-22.5%"(where “%” is the numeric reference for “%”) moves the bottom of the graphic down so the baseline of the logo text lines up with the baseline of the regular text. When thealignment-adjustvalue is a percentage, it is calculated relative to the height, so it remains correct when the font size changes.
The XSL attributes are just copied through when transforming to XSL FO:
<xsl:template match="inline-graphic">
<fo:external-graphic
src="url('{@src}')"
xsl:use-attribute-sets="graphic-atts"
content-height="scale-to-fit"
content-width="scale-to-fit"
scaling-method="resample-any-method">
<xsl:copy-of select="@height | @width | @content-height | @content-width |
@scaling-method | @alignment-adjust"/>
</fo:external-graphic>
</xsl:template>
The result is slightly more interesting text, but also more readable where sentences and paragraphs that started with the all-lowercase “xmlroff” now start with the xmlroff logo.