What makes me ask such a question is this:
I have been told that when we talk about things/persons closely related to a subject-matter, "the + thing/person" representing a class can be used.
For example, when we talk about the cruise liner "Queen Elizabeth II", as a subject-matter, people/things within which, like passengers, lifeboats, sailors etc. can be replaced by the passenger, the lifeboat, the sailor, etc. to represent the individual classes. Accordingly, I thus use "the teacher", "the pupil", the headmaster" to represent teachers, pupils, headmasters when talking about the subject-matter "kindergartens", as they are the persons closely related to such institutions . I wondered if it was called "things in the context"? I'm not sure. Maybe I have mistaken the use of the principle.