s
reasonable at the time the event happened. 
The FHIR AuditEvent is aligned and cross-referenced with <a href="https://profiles.ihe.net/ITI/TF/Volume1/ch-9.html">IHE Audit Trail and Node Authentication (ATNA)</a> Profile.

For details, see
<a href="security.html#audit">Security: Audit</a>.

</p>
<p>Organizations should have a policy regarding purging of data, such as AuditEvent resources which can become numerous. Some types of AuditEvent may have limited value after a period (e.g. year) of time and may be