Each XperienCentral page is connected to a " design template ". A design template, what which is often referred to as a "template" in other CMS systems, is connected to a JSP file. It is used by XperienCentral to generate the source code (HTML, for example) for a page. One You cannot access these JSP design templates directly from the webserver - an editor has to assign it to a created page.
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Besides the XperienCentral taglib, third party taglibs can be used, such as the JSTL taglibs. JSTL taglibs allow the use of statements such as if-then, choose, and forEach in a JSP. Other functions are used to format dates, to use locales, and to execute queries. See Example Design Layout for more documentation about these taglibs.