DocsFaqFAQCopy as MarkdownfaqFAQFrequently asked questions about YounndAI Domains.General What is YounndAI Domains? Is this like Schema.org? Is this free? Is this healthcare-only? Technical How does versioning work? What are the 5 field types? What's the relationship between YON and Domains? Can I use Domains without YON? What are domain records? For AI Agents How do AI agents discover schemas? Can agents use schemas at runtime without prior knowledge? How do I validate data against a domain? For Publishers Can I create my own domain? What are the 4 tiers? How is conformance scored? Where do the 31+ official domains come from? Operations What happens when a version changes? How do I pin to a specific version? Is there offline support? What are notices? What are the API rate limits? What happens if I don't pay?← API Reference