The keyword term "september 11th this year day" functions grammatically as a noun phrase. The core element, or headword, of this phrase is the noun "day". This determination is crucial because it establishes that the main point of the article will be a specific entitya particular daterather than an action, a description, or a relation.
In a grammatical analysis, the other components of the phrase serve as modifiers to specify which "day" is being discussed. "September 11th" acts as an adjectival modifier, identifying the specific date. "This year" is a temporal specifier, further narrowing the context to the current annual cycle. Although the syntax is unconventional for standard prose, its function is clear: to isolate a single, specific temporal concept. The structure is [Modifier 1: Date] + [Modifier 2: Timeframe] + [Head Noun: Concept].
For the article's focus, this means the central theme must be the event, significance, observances, or attributes of September 11th as it occurs within the current year. The subject is the day itself. Consequently, the article should be structured to describe, define, or explain aspects of this specific day, treating it as the primary subject of all clauses and arguments presented.
