TXT - expressions into IS NULL predicate
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                 Key: GEOT-1932
                 URL: http://jira.codehaus.org/browse/GEOT-1932
             Project: GeoTools
          Issue Type: New Feature
          Components: core cql
    Affects Versions: 2.5-M2
            Reporter: Mauricio Pazos
            Assignee: Mauricio Pazos
             Fix For: 2.5-RC0


Nowadays CQL parses "is null predicate" using the following rule: 

<null predicate> ::= <attribute name> "IS" [ "NOT" ] "NULL"

TXT is going to extend that to allow expressions. This is the new rule

<null predicate> ::= <expression> "IS" [ "NOT" ] "NULL"

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