The keyword phrase "11th september edinburgh" functions grammatically as a proper noun or a compound noun phrase. It operates as a single semantic unit to name a specific, unique entity, such as an event, a publication, a project, or a specific topic of inquiry associated with that particular date and location.
The phrase is composed of two distinct nominal components: "11th September," which is a noun phrase identifying a specific date, and "Edinburgh," which is a proper noun for a city. When combined, they form a more specific proper noun. While functioning as a noun, this phrase can also serve an adjectival role when used as an attributive noun (or noun adjunct). In this capacity, it modifies another noun, as in "the 11th september edinburgh conference" or "the 11th september edinburgh report." Here, the entire phrase describes the type of conference or report.
For the purpose of an article, identifying "11th september edinburgh" as a proper noun is the critical step. This determines its grammatical function within a sentence, typically as a subject or object, and guides capitalization. If it refers to the official title of an event, it should be capitalized accordingly. Understanding its dual potentialas a standalone noun and as a modifierallows for precise and varied sentence construction throughout the text.