Cross Domain
Standards in the catalog that belong to cross domain — 18 of them. A standard is listed here only when it is specific to this industry; the general-purpose ones it also relies on, like HTTP, OAuth and JSON Schema, deliberately carry no domain.
The same industry, as data models
49 data models define what information exists in cross domain, as opposed to the standards applied in API operations listed below. Same industry, two lenses.
See the cross domain data models →| Standard | What it is |
|---|---|
| AI Preferences (aipref) | The IETF aipref working group is defining a vocabulary for expressing preferences about how content may be used by AI systems, and how to attach th... |
| Agent Network Protocol (ANP) | The Agent Network Protocol is an independent, open specification set for agents to identify, describe and discover each other across the open inter... |
| CloudEvents | CloudEvents is a CNCF specification for describing event data in a common, vendor-neutral format. It defines required and optional context attribut... |
| DNS for AI Discovery (DNS-AID) | DNS-AID is an individual IETF draft for publishing AI agents in the Domain Name System so other agents can discover them, including reserved parame... |
| Digital Product Passport Standards (CEN/CENELEC JTC 24) | Eight European standards, EN 18216 to EN 18246, define how the EU Digital Product Passport works horizontally: identifiers, data carriers, storage,... |
| IEEE P3931 Agent Description, Discovery and Registry (ADDR) | IEEE P3931 is a standards project, approved in March 2026 and in draft development, to specify a description model, registry mechanisms and discove... |
| ISO 8601 | ISO 8601 is an international standard for representing dates and times in a clear, consistent, and unambiguous format. It is widely used in APIs an... |
| JSON Schema | JSON Schema enables the confident and reliable use of the JSON data format, bringing consistency, validity, and interoperability to enterprise oper... |
| JSON-LD | JSON-LD (JavaScript Object Notation for Linking Data) is a W3C standard for expressing linked data in JSON. It adds lightweight semantics to ordina... |
| MCP Server Cards | An MCP Server Card is a static metadata document that describes a remote MCP server well enough for a client to discover and connect to it. Domain-... |
| Personal Agent Consent & Trust Protocol (PACT) | PACT 1.0, open-sourced by Decagon in October 2026, builds on A2A to define how a customer's personal agent identifies itself to a business's suppor... |
| RDF | RDF (Resource Description Framework) is a W3C standard data model for describing resources as subject-predicate-object triples, providing a common,... |
| Schema.org | Schema.org is a collaborative, community-driven vocabulary (launched in 2011 by Google, Microsoft, Yahoo!, and Yandex) that defines shared types an... |
| UML | UML (Unified Modeling Language) is a standardized, general-purpose visual modeling language maintained by the Object Management Group for specifyin... |
| WebMCP | WebMCP lets a web page give AI agents JavaScript tools through a registerTool() API in the browser, so an agent can act on a site through functions... |
| iCalendar | iCalendar (RFC 5545) is the standard data format for representing and exchanging calendaring and scheduling information such as events, to-dos, and... |
| vCard | vCard (RFC 6350) is the standard file format for electronic business cards, encoding contact information such as names, addresses, phone numbers, a... |
| vCon (Virtualized Conversations) | vCon is an IETF format for a conversation as a portable document: the parties, the dialog, attachments and analysis such as transcripts and summari... |