Document a Riprap schema

[mjordan]

This would basically describe the database structure, but would be framed such that any plugin needs to persist data in its own way corresponding to this schema.

[mjordan]

datestamp has a string value, for the following reasons:

• in the PREMIS 3.0 schema, it has a string data type and not a date/time data type
• if we use ISO 8601, the timezone is encoded in the string
• strings are much more storage-agnostic than date data types.

The value must account for Daylight Saving Time.

[mjordan]

The schema should use elements that are consistent with the command options:

• resource_id
• timestamp (see #7)
• digest_algorithm (see #7)
• digest_value (see #7)
• event_uuid
• event_detail
• digest_value
• outcome

Plus:

• event_detail
• event_outcome_detail_note

[mjordan]

The database structure should be described as part of persist plugin documentation. WIP in branch issue-26.