The keyword term functions as a noun phrase. The main point and grammatical head of this phrase is the noun "timeline." The component "Sep 11" serves as a modifier, specifying the subject of the timeline.
In this construction, "timeline" is a noun that refers to a chronological arrangement of events. The preceding term, "Sep 11," is a proper noun (representing the date and its associated historical events) that acts as a noun adjunct. A noun adjunct is a noun that modifies another noun, effectively functioning like an adjective. This grammatical structure clarifies precisely which timeline is the subject, similar to phrases like "climate change report" or "election results," where the first noun specifies the context of the second.
Understanding this grammatical role is crucial for the article's focus and structure. By identifying "timeline" as the core noun, the article's primary objective is established: to present a sequence of events in chronological order. The modifier "Sep 11" sets the specific historical scope. This dictates that the article's content must be a factual, ordered account of events related to that specific date, rather than a thematic essay or an analysis of its broader implications.
