Expression Language (EL) Reserved Keywords

Expression Language (EL) Reserved Keywords

Value	Description
and	Logical operator alternative to (&&)
false	Boolean literal
le	Relation operator less than or equal to alternative to (<=)
not	Logical operator reverse alternative to (!)
div	Arithmetic operator division alternative to (/)
ge	Relational operator greater or equal to alternative to (>=)
lt	Relational operator less than alternative to (<)
null	Null literal
empty	The empty operator is a prefix operation that can be used to determine whether a value is null or empty.
gt	Relational operator greater than alternative to (>)
mod	Arithmetic operator modulo alternative to (%)
or	Logical operator alternative to (||)
eq	Logical operator alternative to (==)
instanceof	Java Keyword to do a Class comparison between Objects
ne	Relational operator not equal alternative to (!=)
true	Boolean literal

JSF 2.x Expression Language (EL) Implicit Objects

Value	Description
application	This provides user access to the ApplicationContext implementation of ServletContext that represents a web application's execution environment. Note: This is not related to the JSF Application object.
applicationScope	Maps application-scoped variable names to their values.
cc	Implicit EL object that provides access to the JSF Composite Component. cc refers to the top level composite component processed at the time of evaluation
component	Implicit EL object representing javax.faces.component.UIComponentfor the current component.
cookie	Maps a cookie name to a single cookie.
facesContext	The FacesContext instance for the current request.
flash	Provides user access to the EL implicit javax.faces.context.Flash object. It may additional obtained via #{facesContext.externalContext.flash}. The implementation must ensure that the flash is usable from both JSP and from Facelets for JSF 2.
header	Maps a request header name to a single value.
headerValues	Maps a request header name to an array of values.
initParam	Maps a context initialization parameter name to a single value.
param	Maps a request parameter name to a single value.
paramValues	Maps a request parameter name to an array of values.
request	EL implicit object for current request.
requestScope	Maps request-scoped variable names to their values.
resource	EL implicit object for javax.faces.application.ResourceHandler.
session	Provides EL access to the current HttpSession object.
sessionScope	Maps session-scoped variable names to their values.
view	Provides access to the javax.faces.component.UIViewRoot for the current instance.
viewScope	Maps view-scoped variable names to their values.

Ref: http://javaevangelist.blogspot.com.br/2013/04/jsf-2x-tip-of-day-jsf-expression.html