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SIE.8:2 - Problem

Materialization can improve latency and independence from source availability but creates copied state, invalidation, custody, storage, and refresh obligations. Virtual access can preserve source currency and authority but inherits source latency, availability, access, and query-capability limits. A hybrid can isolate hot or stable subsets but adds coherence and branch complexity.

When the choice is made from technology labels, these consequences remain hidden until operation. A copied graph is described as semantic truth, a federation as automatically current, or a cache as harmless optimization. The same mapping semantics can yield different provenance, currentness, error, and recovery behavior in each realization.