code: func (c *Connector) UpsertSchema(ctx context.Context, scope, namePrefix string, ed []*dosa.EntityDefinition) (*dosa.SchemaStatus, error) {
  	if c.Next == nil {
  		return nil, NewErrNoMoreConnector()
  	}
  	return c.Next.UpsertSchema(ctx, scope, namePrefix, ed)
  }
docs: // UpsertSchema calls Next