Some specifications in EE are a bit unusal, in the sense that some metadata cannot be processed at deployment time.
One example: the implicit TLDs for JSP, which actually use different validation rules compared to regular TLDs, and are only supposed to be read when translating the JSP. So it would be nice to have a way for the deployer to skip (I did it by overriding parse for now, but this could be more elegant, I think).
