The keyword term functions as a compound noun phrase. The main point, or head noun, is "notification." The preceding words, "11 september" and "holiday," act as adjectival modifiers that specify the nature of the notification. Therefore, the essential part of speech for the entire phrase is a noun.
This grammatical structure is built upon the principle of noun adjuncts, where nouns are used to modify other nouns. In this sequence, "september" (part of the proper noun "11 september") modifies "holiday," creating the specific concept of the "September holiday." This entire unit, "11 september holiday," then functions as a single adjectival concept that modifies the final noun, "notification." The analysis breaks down as: [ (11 september) holiday ] notification. The core subject is the announcement itself, not the date or the event.
Identifying "notification" as the head noun is critical for article development. It dictates that the article's primary focus should be on the communication, announcement, or official notice regarding a holiday on September 11. The content should address the details of the noticeits source, content, audience, and implicationsrather than focusing on the history or observance of the holiday itself. This grammatical distinction ensures the content directly aligns with the user's search intent, which is to find information about a specific official communication.
