if ( ( n_terminal == null ) || ( c_terminal == null ) ) {
throw new IllegalArgumentException( "attempt to create binary domain combination using null" );
}
- _id0 = n_terminal;
- _id1 = c_terminal;
+ //_id0 = n_terminal;
+ //_id1 = c_terminal;
+ _data = n_terminal + SEPARATOR + c_terminal;
}
public static BinaryDomainCombination createInstance( final String ids ) {