Why is the fn: tag being ignored everywhere?

Just trying to see if is useful... why do all the articles on taglibs ignore the fn: taglib? Even the IDE I use - borland JBuilder ignores it completely in its code assitance...
Any particular reason?

The fn: taglib is new with JSP 2.0 (JSTL 1.1). Most of the tutorials out there (and most of the servers out there last I checked) work with JSTL 1.0 which did not have the function library.

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