Rasarnavasudhakara 3.429

3.429

atha prakaraṇam-
yatretivṛttam utpādyaṃ dhīra-śāntaś ca nāyakaḥ |
rasaḥ pradhānaṃ śṛṅgāraḥ śeṣaṃ nāṭakavad bhavet ||

Now, the play of invented plot (prakaraṇa)— / Where the storyline is invented, the hero is self-controlled and calm (dhīraśānta), / the predominant aesthetic sentiment is the erotic (śṛṅgāra), and the rest is like a drama (nāṭaka)— || 221