This tag library is the specified version of the ui: tag library found in pre JSF 2.0 Facelets. The specification for this
library can be found in the VDLDocs for the ui: library.
There are three things this tag can include: plain XHTML, and XHTML pages that have either a composition tag or a component tag.
An EL expression is parsed as either a value expression or a method expression. A value
expression refers to a value, whereas a method expression refers to a method on an
object.
Faces (...) component model that requires expressions to represent more than just rvalues. It needs expressions to represent
references to data structures
1.9 Logical Operators
The logical operators are:
&& and and
|| and or
! and not
The evaluation of logical operators is described in the following sections.
<?xml version='1.0' encoding='UTF-8' ?>
<h:panelGroup xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html">
<?xml version='1.0' encoding='UTF-8' ?>
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html">
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">