A Data Structure Instance is a populated occurrence of a Data Structure Definition. It contains actual values that conform to the governing Data Structure Definition.
A Data Structure Instance may appear as a message, record, event, assertion, command, command acknowledgement, status report, heartbeat, policy decision, release record, audit event, provenance record, or persisted entry.
A Data Structure Instance may move through a Communication Endpoint, reside in a persistence mechanism, support an audit trail, or appear in an evidence package. It remains distinct from the Data Structure Definition that governs it.
populated occurrence of a Data Structure Definition
Adapted from FX Demo Reference Architecture, Section 2.1.4, Data Structure Instance; aligned with SIP-RA separation of structured artifacts from their definitions and interpretations.
A Data Structure Instance is not a Data Structure Definition, Communication Endpoint, DDS Topic, Node, or Runtime Plane.
A specific cash-flow obligation record with a transaction identifier, payment date, currency, amount, payer, and receiver is a Data Structure Instance governed by a cash-flow obligation Data Structure Definition.
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