Standards & Interoperability / Concept
xAPI extension
Definition
A custom property expressed in an xAPI extensions map using an IRI as the key and any JSON value or structure as the value. Extensions can appear in Activity Definitions, Statement Context, or Statement Result.
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Open this concept in the glossary →Editorial explanation
Extensions give communities room to represent domain-specific information while keeping the core Statement model stable; interoperability is strongest when built-in properties are used whenever possible.
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Sources and evidence
- IEEE xAPI Base Standard — IEEE 9274.1.1-2023 §5.2.7 — Additional Requirements for Data Types: Extensions (direct)