The fbc v3 file is missing, similar to the v2 file for fbc at https://github.com/sbmlteam/sbml-specifications/blob/release/RelaxNG/sbml-fbc-v2/sbml-fbc-v2.rng
The fbc v3 file is missing, similar to the v2 file for fbc at
https://github.com/sbmlteam/sbml-specifications/blob/release/RelaxNG/sbml-fbc-v2/sbml-fbc-v2.rng