[Humble]

Casiopea,
What kind of parsing does diagramming require – morphological (parts of speech) or syntactical (parts of the sentence)?
According to your parsing, morphological.
Then I don’t understand why the is a determiner (a syntactical term) and not an article. My is a a determiner, too, isn’t it?
And here comes the phrase I mentioned in my previous post: functions as an adjective.

OK, I’ll try again to explain my view:
Morphology is like names of people working in a company – Mr.A (the Article), Mr. P (the Pronoun), Mr. V (the Verb) etc.

Syntax is their functions – Mr. A and Mr.P are, say, guards; Mr.N (the Noun) is manager etc. All the staff in this family-like company are good friends and willingly perform each other’s functions if necessary.

We cannot say Mr.P now is working as Mr.N , we can only say Mr.P is working as manager now.

As is followed by a function; adjective is not a function, it can itself have different functions, though its main one is attribute.
Am I right?