I've found the instanceof operator in JSF EL, but it throws an exception when used. It's obviously reserved but not implemented? When will it (probably) be available, if not already in a newer version than JSF 1.2, which I'm currently using?
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The keyword instanceof
is indeed reserved in the EL (see here), but it is still not used in the latest version of EL (2.2), used in JSF 2.x.

Romain Linsolas
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2According to http://java.net/jira/browse/JSP_SPEC_PUBLIC-113 it's fixed in JSF 2.1, is it ? – Hendy Irawan Apr 12 '12 at 12:46