Data & Instrumentation / Practice
Statement immutability
Definition
The xAPI principle that key semantic parts of a Statement are not changed after the Statement has been stored. The standard identifies specific properties that are immutable and others that may differ without changing the Statement’s essential meaning.
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Open this concept in the glossary →Editorial explanation
Immutability allows Statements to be shared between LRSs while preserving the evidence they represent and reduces ambiguity about whether two copies describe the same event.
Related concepts
Sources and evidence
- IEEE xAPI Base Standard — IEEE 9274.1.1-2023 §5.2 — LRP Data Requirements: Statement Immutability (direct)