In the Community Edition Style Design template plugin, a page is constructed as follows:

The headers and footers are respectively above and below all other content. The middle part contains the remaining content and the blocks on the right-hand side.

Tag Library Documentation

Java Standard Tag Library (JSTL)

When creating JSPs there are three commonly used Java Standard Tag Libraries:

Logical functions (c:set, c:if, c:choose, c:forEach)
String functions (fn:replace, fn:substring, fn:trim)
Formatting functions (date formatting, locales)

Additional details about JSTL fall beyond the scope of this document, but several tutorials are available online. A handy overview of the most frequently used JSTL functions is available at: http://download.oracle.com/docs/cd/E17802_01/products/products/jsp/jstl/1.1/docs/tlddocs/.

XperienCentral Tag Libraries

Additional details about the XperienCentral tags are available via:

The XperienCentral JavaDoc
The Plugin GUI Guidelines