Firebird Documentation Index → Firebird 2.1 Language Ref. Update → Reserved words and keywords → Possibly reserved in future versions
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Possibly reserved in future versions

The following words are not reserved in Firebird 2.1, but are better avoided as identifiers because they will likely be reserved – or added as keywords – in future versions:

BOOLEAN
FALSE
TRUE
UNKNOWN
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Firebird Documentation Index → Firebird 2.1 Language Ref. Update → Reserved words and keywords → Possibly reserved in future versions