Event timelines can carry various types of broadcast metadata synchronized with media content. The "MSF Event Timeline Types" registry (Section 14.2) maintains a list of well-known event types. Publishers SHOULD use registered types when applicable to ensure interoperability.
Event timelines can carry data types including but not limited to:
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Ad insertion signaling (e.g., SCTE-35 splice points) - see [SCTE35-MSF]
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Out-of-band timed-text cues (WebVTT, IMSC1) - see [WebVTT-MSF] and [IMSC1-MSF]
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Sports scores and game state
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GPS coordinates and telemetry
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Active speaker notifications
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Custom application-specific metadata
The packaging format and data structure for each event type is defined by the specification referenced in the registry. Custom event types not in the registry SHOULD use Reverse Domain Name Notation (e.g., "com.example.myeventtype") to avoid naming collisions.