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From rposkocil <>
Subject [GitHub] metamodel issue #139: Support for NOT / NOT IN operator
Date Sun, 08 Jan 2017 21:14:42 GMT
Github user rposkocil commented on the issue:
    Correct me, please @kaspersorensen, but NegationOperator is much more general than different
from and additing another way to propositional logic of filters. Operator Different from is
used just for childs of filters and it's represented with <>. For example SQL NOT keyword
has a wider usage. You can negate also composed filters on all levels or different from, too.
This functionality I didn't found there and thought that it could be fine.
    There is no way to negate IN construct in the currecnt version of MetaModel. That's why
Hans created this requirement. There can be IN and NOT IN operators like = and <>. A
similiar case.
    So both parts make me sense and don't brake the concept. But I understand that there could
be other problems that's why constructors were doubled with negationa and without. 

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