# HEXT Standard 1.0

> HEXT (Human Evidence Exchange and Traceability) is an open standard for crystallized, auditable knowledge objects. HEXT is a Semantic Object Graph; Semantic XML is the canonical serialization. HEXT Standard 1.0 is the current stable release.

HEXT is not a product. The HEXT-AI Organization maintains the normative specification. Reference implementations are distributed separately.

## Specification

- [Normative Specification](https://hextai.com/spec/): HEXT Standard 1.0 portal
- [Conformance](https://hextai.com/conformance/): Core requirements and implementation profiles
- [Lifecycle](https://hextai.com/lifecycle/): Document status model
- [SPECIFICATION.md](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/SPECIFICATION.md): Canonical normative document

## Registry

- [Object Registry](https://hextai.com/registry/): Semantic object catalog (preview)
- [Registry Catalog JSON](https://hextai.com/registry/catalog.json): Machine-readable registry index
- [RFC-NVS20](https://hextai.com/object/RFC-NVS20/): HEXT container specification object
- [RFC-NVP18](https://hextai.com/object/RFC-NVP18/): Reference RFC object
- [EXP-Phase30BC](https://hextai.com/object/EXP-Phase30BC/): Experimental evidence object

## Schemas

- [XML Schemas](https://hextai.com/schemas/): XSD modules and namespace reference
- [hext-core.xsd](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/schemas/hext-core.xsd): Normative core schema
- [hext-rfc.xsd](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/schemas/hext-rfc.xsd): RFC extension
- [hext-experiment.xsd](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/schemas/hext-experiment.xsd): Experiment extension
- [Canonicalization](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/docs/canonicalization.md): Hash and C14N rules

## Examples

- [Examples Index](https://hextai.com/examples/): All reference documents
- [minimal.hext.xml](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/examples/minimal.hext.xml): Minimal valid document
- [rfc.hext.xml](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/examples/rfc.hext.xml): RFC-class example
- [experiment.hext.xml](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/examples/experiment.hext.xml): Experiment example

## MCP

- [MCP Profile Documentation](https://hextai.com/mcp/): Tool and resource design (no live transport)
- [MCP Server Card](https://hextai.com/.well-known/mcp/server-card.json): Discovery Profile metadata (SEP-2127, draft)
- [Reference MCP Server](https://github.com/HEXT-AI/hext-mcp): Planned MCP Profile reference implementation

## Profiles

Implementation profiles are additive to Core. See [Conformance — Profiles](https://hextai.com/conformance/#profiles).

- **Core Profile** — Stable · Required (Semantic Object Graph, Canonical XML, Provenance, Ledger, Object Identity)
- **Discovery Profile** — Stable · Optional (llms.txt, sitemap, JSON-LD, MCP Server Card)
- **Registry Profile** — Planned (registry, catalog.json, object and schema discovery)
- **MCP Profile** — Planned (MCP transport, tools, resources, prompts)
- **WebMCP Profile** — Planned · HEXT Standard 1.1 (browser discovery, navigator.modelContext, WebMCP transport)

hextai.com is **WebMCP Ready** (discovery metadata). Live MCP transport and WebMCP runtime are not deployed.

## API

- [API Documentation](https://hextai.com/api/): REST endpoint design and content types (design only)
- [JSON Mapping](https://raw.githubusercontent.com/HEXT-AI/hxt-spec/main/json/mapping.md): JSON transport projection rules

## Documentation

- [Docs Index](https://hextai.com/docs/): Full documentation index
- [Getting Started](https://hextai.com/docs/getting-started/): Quick start guide
- [Philosophy](https://hextai.com/about/philosophy/): Design principles
- [FAQ](https://hextai.com/docs/faq/): Common questions
- [Contribution Guide](https://hextai.com/docs/contribution/): How to contribute

## Optional

- [Reference Repository](https://github.com/HEXT-AI/hxt-spec): Specification source (hosting infrastructure)
- [HEXT-AI Organization](https://github.com/HEXT-AI): Governance and standards body
- [Full LLM index](https://hextai.com/llms-full.txt): Extended resource list