Rabbinic literature studies the Mishnah, Talmud and midrashic collections as a historically layered corpus, built up by named schools and generations of rabbis over centuries, dating individual traditions within it by internal argument, cross reference and comparison rather than treating the whole corpus as a single timeless text. The twenty four year old Leopold Zunz gave the field its founding manifesto in 1818 with a short essay, Etwas uber die rabbinische Literatur, arguing that postbiblical rabbinic writing was a serious and largely unstudied literature that deserved the same scholarly attention as classical antiquity, a year before he and colleagues formalized that program in the Verein fur Cultur und Wissenschaft der Juden.
Jewish law and practice as it is actually lived draws heavily on rabbinic interpretation layered over centuries onto the biblical text, and rabbinic literature scholarship is what lets the atlas distinguish a ruling with roots in the earliest tannaitic period from a later medieval or early modern addition that a tradition may present as equally ancient. The atlas relies on the discipline wherever a claim about Jewish law or practice traces its authority back through the rabbinic corpus.