Semantic Rules

What are Semantic Rules?

Semantic rules are if-this-meaning-then-that-action policies. They trigger on intents, entities, relations, or contexts (e.g., “waterproof” ⇒ add Waterproof facet; “gift card” ⇒ redirect to landing; “GTX” ⇒ map to GORE-TEX attribute) and apply synonym expansions, boosts, filters, redirects, or badges.

How It Works (quick)

• Triggers: Query patterns, extracted entities/attributes, locale/category, time window, device/segment.
• Actions: Add/remove facets, adjust boosts, insert best bets, trigger promotions, or rewrite queries.
• Scope & priority: Rule sets per category/locale; conflict resolution and caps.
• Governance: Versioned configs, tests, owners, and scheduled expiry.

Why It Matters in E-commerce

• Coverage gaps: Patch catalog wording vs shopper slang.
• Business control: Launch seasonal boosts and campaigns without reindexing.
• Safety: Enforce hard constraints (compliance/age/region) based on detected meaning.

Best Practices

• Late binding: Apply at query/ranking time; keep the index lean.
• Caps/guardrails: Limit rule impact; never outrank clear relevance.
• Explainability: Log which rule fired and why; show editable chips to users.
• Localization: Separate dictionaries per market; respect units/sizes.
• Maintenance: Quarterly audits; prune low-impact rules.

Challenges

• Drift and bloat, conflicting rules, multilingual ambiguity, and hidden tech debt.

Examples

• “rainproof runners” → add Waterproof facet; map “runners” ↔ trail shoes.
• “gift card” → Best Bet to gift card page; suppress product grid.

Summary

Semantic rules give precise, explainable control over meaning-driven cases. Keep them late-bound, capped, localized, and well-logged.