Xform naming in new pull syntax

General
1

Why do datomic team choose xform for the “function that transform the value” in datomic?
xform is also used in clojure.core to represent “a function that receives a ‘reducing function’ and returns a 3-sig function”

There is some abstract that describes what is a xform? they are completely unrelated?

2

It is just short for “transform”. The prefix “trans” means “across”, and an “x” is a cross, so it’s used as the abbreviation sometimes.