You can find the full source code for this website in the Seam package in the directory /examples/wiki. It is licensed under the LGPL.
There are three different EL specifications:
The EL's for JSP 2.0 and JSF 1.1 were not compatible. The Unified EL brings these EL's together under one specification. The Unified EL was created by the JSP 2.1 expert group (JSR-245), but it is its own separate specification.