وَهُوَ عَلَى قِسْمَيْنِ:
Translation: It is of two kinds.
The source gives two kinds: muttasil (connected) and munqatiʿ (disconnected).
In a connected exception, the excluded item belongs to the category or group.
In a disconnected exception, it does not belong to that category.
Identify the kind through meaning, not merely through the presence of illā.