No, Jinja is not a strict addition to the Django template language. A good summary of the differences is provided in the documentation .
There is no particular reason why Jinja will be a superset of DTL. This means a standalone package that can be used by any Python web card. I would say that most of the differences are related to Jinja's attempt to be less restrictive and more Pythonic than DTL. For example, while DTL allows filters to accept only one argument and uses a unique character :to indicate it, Jinja allows any number of arguments and uses ordinary characters ().
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