B.1 Syntax
A JSF EL expression starts with the
#{ delimiter (a hash mark plus a left curly brace)
and ends with } (a right curly brace):
#{anExpression}
When used in an attribute value for a standard JSF custom action, any
number of EL expressions and static text parts can be combined. Such
an expression is read-only, with the evaluation result of each
expression converted to a String and then
concatenated with the text parts:
<h:outputText value="The result of 1 + 2 + 3 is #{1 + 2 + 3}" />
The language is case-sensitive. All keywords are in lowercase, and
identifiers must be written with correct capitalization.
B.1.1 Literals
Literals represent strings, numbers, Boolean
values, and the null value.
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String
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Enclosed with single or double quotes. A quote of the same type
within the string must be escaped with backslash: \'
in a string enclosed with single quotes, \" in a
string enclosed with double quotes. The backslash character must be
escaped as \\ in both cases.
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Integer
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An optional sign (+ or -) followed by digits between 0 and 9.
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Floating point
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The same as an Integer literal, except that a dot is used as the
separator for the fractional part and that an exponent can be
specified as e or E followed by an Integer literal.
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Boolean
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true or false
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Null
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null
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B.1.2 Keywords and Reserved Words
The following words are keywords or reserved for potential use in a future
version:
and or not eq ne lt gt le ge true false null instanceof empty div mod
They can't be used as property names or variable
names, unless they are quoted.
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