Core Unique (Graph Layer)

Core Unique is the highest layer in the three-tier knowledge graph hierarchy, containing attributes classified as UNIQUE and ROOT — those that are unique to a given entity or constitute its fundamental definition. In the URR model (Unique-Root-Rare), UNIQUE attributes are facts that differentiate the entity from all others (e.g., 'the only aquapark in Krakow with a wave'), while ROOT attributes are basic defining facts (e.g., 'location', 'opening hours'). Content built on the Core Unique layer has the highest ranking potential because it delivers information unavailable from competitors. The Core Unique layer should be your priority when planning content — this is where 'must-have' articles are created.

For example, for a law firm, Core Unique consists of specific rulings, interpretations, and case studies that no other site has. In practice, if your article doesn't contain a single UNIQUE attribute, it will be difficult to stand out from the competition — add at least one unique fact, case study, or expert perspective.