@Jo I would also add that my claim that the "Extra" layer adds some benefit is in the fact (which I already explained to you several posts back) that most of the languages tend to share large portions of their grammar. So we can simply merge the generic rules with the language specific rules to enforce modularity. I suggest you please read my GSoC proposal in its entirety. You can find it at https://github.com/sympy/sympy/wiki/GSoC-2014-Application-Aditya-Shah-SymPy-Parsing-Framework.
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