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About the Firebird 5.0 Language Reference 

The source of much copied reference material: Paul Vinkenoog
Copyright © 2017-2023 Firebird Project and all contributing authors, under the Public Documentation License Version 1.0.Please refer to the License Notice in the Appendix

If you notice any discrepancies, errors or anything missing, please report this on https://github.com/FirebirdSQL/firebird-documentation/issues or submit a pull request with the necessary changes.