The keyword term is a compound noun phrase. Within this structure, "flags" serves as the head noun, establishing it as the primary subject or main point of focus. The words "Patriot Day" and "Katy" function as adjectival modifiers that specify the context of the noun.
The proper noun "Patriot Day" specifies the occasion or theme, indicating the flags are related to the September 11th observance. The proper noun "Katy" acts as a locative modifier, pinpointing the geographic location. Together, these modifiers narrow the broad topic of "flags" to a highly specific subject: flags as they relate to the observance of Patriot Day within the city of Katy.
Therefore, the central theme for an article using this keyword is the physical flags themselves. The article's content should revolve around topics such as local flag displays, flag etiquette for the holiday in that area, events featuring flags, or where residents of the specified city can obtain them for the commemoration. The modifiers provide the essential "when" and "where" context for the core subject.
