On Tue, Apr 30, 2019 at 11:25 AM Niels Charlier <ni...@scitus.be> wrote:

> Hello,
>
> I discovered that the implemented and documented filter function "not"
> doesn't actually work.
>

In what context? See below


>
> The parser treats the word "not" as a reserved word, used for filters,
> therefore it does not manage to parse it as an identifier inside an
> expression.
>

"The parser", but filter functions can be created via code directly, and
via multiple parsers.
I'm guessing you mean CQL, where indeed NOT is a reserved keyword?
Would it work if you create it by code, or create it as part of a OGC
Filter 1.0 for example? Or as part of SLD?


> Perhaps I am missing something, but otherwise the function should
> probably be renamed or removed?
>

Or, if the problem is CQL specific, get the parser fixed so that it can
tell the difference between NOT and NOT().
Does not sound easy, but I'd avoid removing functions, they can be used in
a variety of contexts (e.g., SLD).
Maybe just add an "alias" (a delegating function) that uses a different
name for usage in CQL, if modifying
the javacc parser looks too hard?

Cheers
Andrea

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