Chapter 2. Saxon Extensions
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Beginning with release 1.25, the DocBook XSL Stylesheets include a set of Java extensions for Saxon.

These extensions enable callouts, numbered program listings, and the direct inclusion of text:

    @rem = '--*-Perl-*--
    @echo off
    perl.exe %_batchname %$
    goto endofperl
    @rem ';

    # Compress mail...

    require 'n:/home/nwalsh/lib/cygnus.pl';
    require 'timelocal.pl';
    use Cwd;

    select (STDERR); $| = 1;
    select (STDOUT); $| = 1;

    @DIRS = ("/home/nwalsh/Mail");
    while (@DIRS) {
        $dir = shift @DIRS;
        opendir (DIR, $dir);
        while ($fname = readdir(DIR)) {
            $file = "$dir/$fname";
            next if ! -d $file;
            next if $fname =~ /^\.\.?$/;

            print "$file\n";
            push (@DIRS, $file);
            &compress ($file);
        }
    }

    exit;

| The prologue handles embedding a Perl script in a DOS batch file.
| The `goto` statement, interpreted by the DOS batch file interpreter, skips over the body of the Perl script.
| The `require` statement sources in external program fragments.
| The `use` statement is similar, but has additional utility. It is a Perl5 function. (Note that this callout area specifies both a line and a column.)
| This is a user subroutine call.

The extensions are included in the distribution in `extensions/nwalsh.jar`. Just make sure that jar file is in your CLASSPATH when you run Saxon.

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Customizing DocBook XSL stylesheets | Up | Using the Extensions