XSP supports two types of tag libraries. The simpler is merely an XSLT or XPathScript (or other transformation language) stylesheet that transforms custom tags into the "raw" XSP tag form. The other, however, is faster, and its taglibs transform custom tags into pure code that then gets compiled. These taglibs must be loaded into the server using the AxAddXSPTaglib configuration directive.
# load the ESQL taglib and Util taglib AxAddXSPTaglib AxKit::XSP::ESQL AxAddXSPTaglib AxKit::XSP::Util
If you prefix the module name with a + sign, the module is preloaded on server start-up ( assuming that the config directive is in a httpd.conf file, rather than in a .htaccess file).