code: def check_extensions(self, supported):
          
          if self.data.get('extensionsRequired'):
              for ext in self.data.get('extensionsRequired'):
                  if ext not in supported:
                      raise ValueError("Extension {} not supported".format(ext))
  
          if self.data.get('extensionsUsed'):
              for ext in self.data.get('extensionsUsed'):
                  if ext not in supported:
                      raise ValueError("Extension {} not supported".format(ext))
docs: "extensionsRequired": ["KHR_draco_mesh_compression"],
          "extensionsUsed": ["KHR_draco_mesh_compression"]