Dasharupakam
Dasharupakam (Daśarūpakam) is a treatise on the structure and rules ("Lakshana" or "Prakarana" grantha) for popular theatre and drama presentations of the time, written by Dhananjaya in the 10th century AD. Several techniques and methods presented in the Natyashastra and Dasharupakam are very much in use in today's theatre. The author starts with salutations, among others, to Bharata the author of"Natyashastra", whose detailed exposition he bases his work on. He however in his own words says that he has attempted to present the same in an ordered and concise fashion in his book, so it can be consumed  by common folk. "Rupakam" means one that has a form and can be seen - essentially referring to theatre and drama performances. He uses the same word used by Bharata to refer to his work, and defines ten types of theatre performances - DashaRupakam - Ten Forms of Plays. In the course of describing the forms of the plays, the author discusses, the subjects of "Vastu"(Plot), "Netaa"(the protagonist), and the "Rasa" (the emotive aspect) - which are essential to a play. The "Dasharupakam" comprises four chapters, each termed as "Prakaasha", and has about 300 "karikaas" (verses) in total, as opposed to the 6000 of  the "Natyashaastra". In the field of Sanskrit literature it is tradition to use unique word to refer to each chapter in a book. (Other terms used elsewhere include "Ullaasas", "Parichedaas", "Udyota" etc.). The author treats "Nrutyam","Nruttham " as components of a "rupakam' only (play); The first chapter describes the rules for rupakam, they key elements of Drama ("Vastu"-the plot, "Netaa"(the protagonist), and "Rasa" (the emotive aspect)). Then discusses the types and characteristics of the "Plot" The second chapter explains the characteristics that the "Netaa" (protagonist) heroes and heroines must possess. (neta) The third chapter discusses the ten types of drama. The  fourth chapter discusses "Rasa" in detail. However the author also states that since "Rasa" is a heavy subject - he will only present concise descriptions The influence of "Dasharupakam" is very evident on later Sanskrit dramaturgists. The most famous commentary on the work, known as "Avaloka", was written by Dhanika, a younger brother of the author.. Dhanika has worked to collect example verses from various plays of the time for each rule or "lakshana". (such as Ratnavali, Mrucchakatikam, Venisamhara, Mahaveeracharitam etc.) and add to this book.