highlight.source — Should the content of programlisting
be syntactically highlighted?
When this parameter is non-zero, the stylesheets will try to do syntax highlighting of the
content of programlisting elements. You specify the language for each programlisting
by using the language attribute. The highlight.default.language
parameter can be used to specify the language for programlistings without a language
attribute. Syntax highlighting also works for screen and synopsis elements.
The actual highlighting work is done by the XSLTHL extension module. This is an external Java library that has to be downloaded separately (see below).
In order to use this extension, you must
add xslthl-2.x.x.jar to your Java classpath. The latest version is available
from the XSLT syntax highlighting project
at SourceForge.
use a customization layer in which you import one of the following stylesheet modules:
html/highlight.xsl
xhtml/highlight.xsl
xhtml-1_1/highlight.xsl
fo/highlight.xsl
let either the xslthl.config Java system property or the
highlight.xslthl.config parameter point to the configuration file for syntax
highlighting (using URL syntax). DocBook XSL comes with a ready-to-use configuration file,
highlighting/xslthl-config.xml.
The extension works with Saxon 6.5.x and Xalan-J. (Saxon 8.5 or later is also supported, but since it is an XSLT 2.0 processor it is not guaranteed to work with DocBook XSL in all circumstances.)
The following is an example of a Saxon 6 command adapted for syntax highlighting, to be used on Windows:
java -cp c:/Java/saxon.jar;c:/Java/xslthl-2.0.1.jar -Dxslthl.config=file:///c:/docbook-xsl/highlighting/xslthl-config.xml com.icl.saxon.StyleSheet -o test.html test.xml myhtml.xsl