Period of validity

Participant Metadata Set is valid 7 days from the time it was fetched. The exact date and time is found in the field notvalidafter.

Refresh

Each participant is required to retrieve a new list with a frequency of at least two times the interval value. Currently interval is set to 24 hours. In other words: At least once every 12 hours or more frequently.

Retrieval

Each participant is responsible for

• retrieving the list and store it in their central/master system
• distributing the list to their own units, think validators

Caching and ETag

Since 2021-12-07, participants are recommended to cache the Participant Metadata Set for up to 1 hour before making an attempt to update it. This value is specified by the Cache-Control max-age response header. After that it is recommended to use ETag and the If-None-Match request header to conditionally get a new Participant Metadata Set only if it is updated. If update is not possible for some reason, the previously fetched Participant Metadata Set is valid for 7 days.

Reference

More information in MTS4, found at https://bitbucket.org/samtrafiken/bob-mts-4-coordination-and-key-management/src/master/mts4.pdf