Product Domain Services

Status

Normative Business Domain Specification

Purpose

Defines domain-level business operations that do not belong to a single entity.

Core Principle

Domain Services implement business behavior, NOT infrastructure behavior.

Invariants Reference

• INV-001 Canonical Identity uniqueness
• INV-002 Identifier is evidence
• INV-003 Observation must not mutate identity
• INV-004 Variant ownership constraint

Services

ProductIdentityResolutionService

Responsible for resolving canonical identity from multiple evidences.

ProductConsistencyService

Evaluates consistency state of a Product.

ProductMergeService

Merges two Products when identity equivalence is proven.

ProductSplitService

Splits a Product when multiple identities are detected.

ProductConflictResolutionService

Handles resolution of Product conflicts.

Rules

Services MUST:

• be deterministic when possible
• respect invariants
• not depend on persistence
• not depend on WordPress or feeds

Decision

Domain Services encapsulate cross-entity business logic only.