URR Classification (Unique/Root/Rare)

URR Classification (Unique, Root, Rare) is a system for categorizing entity attributes into three tiers based on their frequency among top-ranking SERP competitors. UNIQUE attributes (present in 1-2 competitors) are differentiators that provide competitive advantage—these belong in your H1 and opening paragraph to maximize Information Gain.

ROOT attributes are definitional must-haves that become your main H2 sections. Without them, content lacks essential definitional elements. RARE attributes (found in 3-4 competitors) provide extra value, an opportunity for information gain—perfect for H3 sections or FAQ. URR Classification determines heading order in the Contextual Hierarchy and content prioritization: Unique differentiates from competitors, Root ensures completeness, Rare builds advantage in niche sub-queries.

URR Classification integrates with the EAV model and Content Gaps prioritization. The Attribute component from EAV feeds into URR Classification, creating a direct pipeline from entity modeling to content structure.

In practice, use competitive gap analysis to extract attributes from 5–10 top-ranking competitors and apply URR Classification automatically. This produces a ready-made map of what you must cover (ROOT), what will differentiate you (UNIQUE), and what gives a bonus (RARE).