Version 1.3.0
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New features
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* State Machine Models in B-UML: B-UML now allows the specification of State Machine models.
* New `RDF <https://www.w3.org/TR/rdf-schema/>`_ Code Generator: A code generator to produce the RDF representation of a structural model.

Improvements
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* B-UML Structural Models: Added support for specifying methods.
* PlantUML Grammar: Enhanced to support the definition of enumerations and methods for structural models.
* Django Code Generation: Extended to include support for enumerations.
* Backend Code Generator: Extended to handle enumerations and methods.

Fixes
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* Resolved the issue with the deprecated GPT version. You can now specify the OpenAI model (default is ``gpt-4o``).