Database Software

If I take an incremental level 0 backup of an entire database and then take a level 0 of an individual tablespace, does an incremental level 1 backup of that tablespace reference the incremental level 0 of the tablespace or of the entire database? If I change the order of the level 0 backups, does it change the reference of the tablespace's level 1?

I guess what I'm asking is does the the level 1 incremental reference the latest level 0 regardless of whether it's for the whole database or just the tablespace or does a level 1 always reference it's own level 0?

Also, if I take a level 0 of the database Sunday night, and then a level 1 of the database every night after that as well as multiple level 1s of a tablespace throughout each day, will Tuesday night's database level 1 include all of Monday's tablespace level 1s?

I just can't seem to find oracle documentation about these relationships.