xml - Whats the difference between # and $ in ELs in ADF -

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have basic question on difference between # , $ while evaluating els. ex. 

<c:if test="#{bindings.value == true}">

and 

<c:if test="${bindings.value == true}">

the $ called immediate evaluation syntax, while # called deferred evaluation syntax check out reference http://docs.oracle.com/javaee/5/tutorial/doc/bnahq.html#bnahr


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