Grammar Validation #9
Description
Currently there is no validation on the grammar other than grammatical rules themselves.
Validation should be established in areas that would cause ambiguity such as response types that share the same response code, it can be argued that it should not be possible to have to response definitions of the same response code, or that more than one API can exist in a given context because the current code generators do not support this.
Therefore, considering the assumptions made on code generation from the grammar, the grammar should be validated to these constraints.
Validation can be lifted in the future to support unconventional scenarios.