| # | | Name | Source | Ver | Description |
| 1 | | AuditEvent Accession | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | An Accession Number associated with this participant object. |
| 2 | | AuditEvent agent OnBehalfOf | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | When an AuditEvent is attributed to an agent that is acting on behalf of another agent. Typically needed when multiple agents are acting on behalf of different organizations, and when PractitionerRole is not appropriate. |
| 3 | | AuditEvent Alternative User ID | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | An AlternativeUserID Number associated with this participant object. |
| 4 | | AuditEvent Anonymized | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | True or False indicating whether all patient identifying information was removed from the data. |
| 5 | | AuditEvent Encrypted | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | True or False indicating whether the data was encrypted. |
| 6 | | AuditEvent Instance | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Th SOP Instance UID values. |
| 7 | | AuditEvent Lifecycle | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | An Lifecycle event associated with this participant object. |
| 8 | | AuditEvent MPPS | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | An MPPS Instance UID associated with this entity. |
| 9 | | AuditEvent Number Of Instances | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | The Number of SOP Instances referred to by this entity. |
| 10 | | AuditEvent Participant Object Contains Study | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | A Study Instance ID, which may be used when the Entity type is not (110180, DCM, "Study Instance UID"). |
| 11 | | AuditEvent SOPClass | hl7.fhir.uv.extensions.r4#1.0.0 | R4 | Required if ParticipantObjectIDTypeCode is (110180, DCM, "Study Instance UID") and any of the optional fields (AccessionNumber, ContainsMPPS, NumberOfInstances, ContainsSOPInstances,Encrypted,Anonymized) are present in this Participant Object. May be present if ParticipantObjectIDTypeCode is (110180, DCM, "Study Instance UID") even though none of the optional fields are present. |
| 12 | | AuditEvent.agent Assurance Level | ihe.iti.balp#current | R4 | The assuranceLevel element carries various types of Assurance level. May be an Identity Assurance (IAL), an Authentication Assurance Level (AAL), a Federation Assurance Level (FAL), or other.
In SAML this is [defined to be carried](https://docs.oasis-open.org/security/saml/v2.0/saml-authn-context-2.0-os.pdf) in the `saml:AuthnContextClassRef`, but may be carried elsewhere based on the use-case and profiling of SAML.
The Vocabulary is not defined here. Some sources of vocabulary:
- HL7 v3 [Security Trust Assurance ValueSet](https://terminology.hl7.org/3.0.0/ValueSet-v3-SecurityTrustAssuranceObservationValue.html). These include ISO-7498-2, NIST 800-63-1, and NIST-800-63-2.
- [idmanagement.gov](https://developers.login.gov/saml/#specifying-attributes-and-assurance-levels) published on login.gov
- this is defined to be carried in the saml:AuthnContextClassRef
- OASIS [Authentication Context for SAML](https://docs.oasis-open.org/security/saml/v2.0/saml-authn-context-2.0-os.pdf)
- An example of a customized and purpose defined small set of codes can be found in the HL7 [SMART Health Cards](http://hl7.org/fhir/uv/shc-vaccination/2021Sep/) defines a [valueset](http://hl7.org/fhir/uv/shc-vaccination/ValueSet/identity-assurance-level) |
| 13 | | AuditEvent.agent other identifiers | ihe.iti.balp#current | R4 | Carries other identifiers are known for an agent. |
| 14 | | AuditEvent.agent other identifiers | johnmoehrke.slicingslicedextension#current | R4 | Carries other identifiers that are known for an agent. |
| 15 | | AuditEvent.agent other identifiers name | johnmoehrke.basicaudit.no#current | R4 | Extension to be used within IHE-otherId to carry the name of the identifier. |