The keyword phrase functions as a complex noun phrase. The main point, or the grammatical head of the phrase, is the word "ceremony," which is a noun. All other elements within the phrase serve as modifiers that specify the type, subject, and date of this central concept.
A detailed grammatical breakdown reveals a structure of stacked modifiers. "Patriot Day" is a proper noun acting as an attributive noun (or adjective) to define the official name of the observance. "9 11" is a numeral combination, also functioning as an attributive noun, specifying the historical event being commemorated. Finally, "11 Sep" is a noun phrase indicating the specific date. These components collectively narrow the focus onto the core noun, "ceremony," distinguishing it from other types of ceremonies or other forms of remembrance.
Understanding that "ceremony" is the primary noun is crucial for content development. This grammatical structure dictates that the article's central subject must be the event itselfits proceedings, purpose, participants, and significance. The modifiers ("Patriot Day," "9 11," "11 Sep") are not the main subject but are essential qualifiers that define the context. Therefore, the article should focus on the commemorative gathering, using the other terms to frame its specific occasion and timing.
