This is one of the more important directives. It is responsible for mapping module stylesheet MIME types to stylesheet processor modules. (The reason you do this is to make it easy to switch out different modules for the same functionality—for example, different XSLT processors.)

AxAddStyleMap text/xsl Apache::AxKit::Language::Sablot AxAddStyleMap
            application/x-xpathscript  Apache::AxKit::Language::XPathScript AxAddStyleMap
            application/x-xsp  Apache::AxKit::Language::XSP

If you prefix the module name with a + sign, it preloads on server startup (assuming that the config directive is in a httpd.conf file, rather than a .htaccess file).