Source of truth for implementation is the canonical schema host:
https://schemas.meta-aiml.org/v3.0.0/. If any page text conflicts with canonical schema files, follow canonical files. Documentation home.Multimodal Format
Legacy Route
This route exists for backward compatibility. There is no dedicated multimodal_format.json component in canonical META-AIML v3.
Use canonical v3 components instead of a dedicated multimodal contract.
Recommended v3 Alternatives
Use these canonical files depending on the media use case.
https://schemas.meta-aiml.org/v3.0.0/components/common_defs.json - shared primitive structures.
https://schemas.meta-aiml.org/v3.0.0/components/capability_groups.json - content/media-related capability groups.
https://schemas.meta-aiml.org/v3.0.0/components/structural_metadata.json - structural behavior for content systems.
Entity-specific media fields can be added under entity properties when business-specific.