Contradictions

Independently owned knowledge products will disagree. Two domains publish content about the same subject, both currently effective, and they conflict. This is not a failure of the model; it is a fact about organizations, and the knowledge base has to handle it rather than pretend it will not happen.

Two mechanisms. First, an explicit source-of-truth hierarchy: an ordering of authority, agreed at the governance level, recorded as a rank on each product and applied at retrieval time as a tie-breaker. External regulation above internal policy; the system of record above a derived copy; the newer version above the older. Second, contradiction detection as a platform service: a periodic pass that finds currently-effective knowledge objects with overlapping scope and conflicting statements, and routes them to the owning domains for resolution. The retrieval layer surfaces unresolved conflicts to consumers rather than silently picking one.

Neither mechanism resolves the disagreement. Resolution is a human decision that belongs to the domains. The platform's job is to make the disagreement visible and to apply the agreed tie-break consistently until it is resolved.