How to use the <?perl ... ?> processing
instruction in your RXML pages.
In-line Perl code in <?perl ... ?>
processing instructions can be executed much like scripts, and the
same subset of the Apache API is available as in the perl script
support described in the API section.
The default value for the "Perl Tag Support" configuration
option is "No". This has to be changed to "Yes" for in-line Perl code
to be executed. Also note that the "RXML-parse tag results" option
has to be switched to "Yes" if you want the output produced by the
Perl code to be RXML parsed afterwards.
An example Perl PI tag: