void checkManifest()
void checkManifest(MetsManifest manifest)
    void checkManifest()        throws MetadataValidationException    {        String profile = manifest.getProfile();        if (profile == null)            throw new MetadataValidationException("Cannot accept METS with no PROFILE attribute!");        else if (!profile.startsWith(PROFILE_START))            throw new MetadataValidationException("METS has unacceptable PROFILE value, profile="+profile);    }