Maintain an authorized device-local content cache

Core meaning

Capability purpose: Improve repeated and connectivity-constrained access without turning a device cache into canonical Core state or expanding client authority.
Meaningful outcome: A permitted non-canonical local copy is available, unavailable, refreshed, removed, or rejected with its owner/Core binding, logical source reference, and local state identifiable.
Boundaries — includes: cache eligibility, local copy creation, stable source binding, reuse, inspection, refresh where supported, removal, owner/Core switching, and state reporting.
Boundaries — excludes: selecting content for durable offline retention, preserving pending captures or edits, deleting canonical content, granting application access, storing owner-wide credentials, and implementing server-side retrieval or processing.
Terms and concepts: A cached item is a local copy of accepted content or an authorized projection, such as a schema.org/DigitalDocument or other schema.org/CreativeWork; the logical Core object remains authoritative.

Actor: An authorized device client or PIOS-native device-support component.
Command / intent: Cache, reuse, refresh, validate, or evict one eligible Core object or projection.
Current state: Owner/Core identity, client authority, logical source reference, connectivity, and existing local state can be determined.
Policies / invariants: The copy remains non-canonical; each client retains distinct identity, grants, scopes, and audit attribution; ambiguous authority fails closed; writable disconnected behavior requires an explicit synchronization profile; removal affects only the local copy.
Transition: Validate eligibility and identity, create, inspect, reuse, refresh, or remove the local copy according to the declared implementation profile.
Result: An available, unavailable, refreshed, removed, or rejected cache entry with an explainable non-canonical state.
Events / effects: May reduce repeated transfer, report stale/unavailable content, or trigger re-fetch or owner attention without changing canonical content.
Unknowns: Universal cache size, freshness, encryption, eviction, integrity and telemetry profiles are not established.

A device cache is not a Local Core, canonical source, authorization grant, backup, or pending-work store.
Shared local storage does not merge the identities, grants, scopes, or audit attribution of its clients.

Prefer reuse only when the active implementation profile can establish that the local copy remains eligible; fail closed when identity or authority is ambiguous.

Platform-specific isolation, background refresh, revocation timing, and secure-removal guarantees require implementation profiles.

Statement	Semantic class	Evidence status	Source / note
Authorized device caching remains non-canonical, preserves per-client identity and authority boundaries, and requires explicit synchronization semantics before writable offline operation.	reasonable inference	proposed from committed architecture constraints	Q01–Q05.