Error in Transducers reference

[seeeturtle]

1. In Creating Transducers, it explains

(fn [xf]
  (fn ([] ...)
      ([result] ...)
      ([result input] ...)))

as a function that produce transducers.

Most functions that produce transducers have the following shape (custom code in "…​"):

However, as we can see from clojure functions like map or cat, it is definitely a transducer itself, not a function that produce transducer.

2. In Terminology, it says xf indicates transducer and transducer means function that transform reducing function into another one.

However, in above code, the function has xf instead of rf. I searched other functions but they used rf which indicates reducing function not xf that indicates transducer.

[seeeturtle]

@puredanger, what about the latter one?