As stated in many scholarly books, there are two "versions" of Prose Tristan: short version (attributed to Luce de Gat) and long version (attributed to Helie de Boron).
But I cannot understand why these texts are called "versions", instead of "parts". From my point of view, it is just two successive parts, like Volume 1 and Volume 2.
Maybe the "version" is just incorrect term, or maybe I don't have enough understanding about something?
To be precise, at this time I haven't read not the first nor the second version of the text itself. Instead, I started my journey from reading scholarly books, like this one.