Context
Bing, Google and Yahoo collaborated on Schema.org, creating a shared vocabulary for structured data on web pages.
What changed
Publishers gained a common way to express entities, properties and relationships in machine-readable markup.
Why it matters
Structured data became a durable layer for machine understanding and remains relevant to search, product discovery, entities and AI-facing content systems.
Visibility OS interpretation
An early infrastructure milestone for semantic clarity, not a direct GEO technique.
What remains uncertain
No event-specific uncertainty note is recorded yet. This record may change as new evidence is reviewed.