POS Tagging is a great linguistic feature for tasks such as semantic parsing or named entity recognition. Your tree snippet built out (with the list below) looks as follows: (TOP(Verb, non-3rd-person(Verb Shutdown) The physical place the actual transaction occurs is defined as the point of purchase (POP), so the difference between POS and POP depends on the context when they’re used. POS tagging is still one of the very difficult research areas of Natural Language Processing as a subject with F1-Scores in their high 90%'s. The point of sale payment is when a customer and merchant exchange products or services completing a POS transaction aka point of sale purchase. The tags to the left of the words / lists are what is known as POS ( Part-of-Speech) Tags, that represent the grammatical category the word falls into, essentially a word-category disambiguation. It may remind you of the syntax of a popular LISP such as Scheme or Clojure. The output syntax you see is a tree which take on the form of a series of lists and embedded lists. First of all, learning like in any subject takes time so don't rush it or you will confuse yourself.
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