Standards & Interoperability / Concept
Inverse Functional Identifier (IFI)
Definition
An identifier used by xAPI to uniquely identify a particular Agent persona or Group, such as a mailbox, mailbox hash, OpenID, or account.
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Open this concept in the glossary →Editorial explanation
IFIs are the basis for determining when Agent or Group representations refer to the same identity, which affects querying, deduplication, and record continuity.
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Sources and evidence
- IEEE xAPI Base Standard — IEEE 9274.1.1-2023 §3.1 — Definitions: Inverse Functional Identifier (IFI) (direct)
- IEEE xAPI Base Standard — IEEE 9274.1.1-2023 §5.2.2.1 — Actor: Agent/Group identifying properties (direct)