I think the prefix makes sense.

Btw. in the EL 3.0 PR the `FunctionMapper` interface itself is gone, it's shortly mentioned in section 1.18, though. Not sure what's that supposed to mean. The PR also contains a syntax for referencing static method directly, but this seems to be removed again according to [a mail](http://java.net/projects/el-spec/lists/jsr341-experts/archive/2013-01/message/0) on their list.