public interface SessionFactoryBuilderFactory {
	/**
	 * The contract method.  Return the SessionFactoryBuilder.  May return {@code null}
	 *
	 * @param metadata The metadata from which we will be building a SessionFactory.
	 * @param defaultBuilder The default SessionFactoryBuilder instance.  If the SessionFactoryBuilder being built
	 * here needs to use this passed SessionFactoryBuilder instance it is the responsibility of the built
	 * SessionFactoryBuilder impl to delegate configuration calls to the passed default impl.
	 *
	 * @return The SessionFactoryBuilder, or {@code null}
	 */
	public SessionFactoryBuilder getSessionFactoryBuilder(MetadataImplementor metadata, SessionFactoryBuilder defaultBuilder);
}