The categories are the patiṉeṇmēlkaṇakku ("the eighteen greater text series") comprising  Ettuthogai (or Ettuttokai, "Eight Anthologies") and the Pattuppāṭṭu ("Ten Idylls").
The categories are composed of the eighteen greater text series, which includes the Eight Anthologies (Ettuthogai) and the Ten Idylls (Pattuppāṭṭu).