Timeline Event

A single event inside a timeline content payload.

Metadata

Definition

#/$defs/TimelineEvent

Type

object

Source

spec/schemas/opf.schema.json

Field	Type	Req	Description
when	string	—	Event time, date, or sequence label. Use ISO-like values when possible, but human labels are allowed for quarters, eras, and relative milestones.
what	string	yes	Short event label.
description	string	—	Optional event detail.

Type: string · Optional · Default: —

Event time, date, or sequence label. Use ISO-like values when possible, but human labels are allowed for quarters, eras, and relative milestones.

when.json

{
  "when": "2026-01"
}

Type: string · Required · Default: —

Short event label.

what.json

{
  "what": "Pilot"
}

Type: string · Optional · Default: —

Optional event detail.

description.json

{
  "description": "Launch with the first operations team."
}