> For the complete documentation index, see [llms.txt](https://relationlabs.gitbook.io/protocol/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://relationlabs.gitbook.io/protocol/key-concepts.md).

# KEY CONCEPTS

- [RDF](https://relationlabs.gitbook.io/protocol/key-concepts/rdf.md): Relation Protocol supports the RDF standard.
- [Semantic SBTs](https://relationlabs.gitbook.io/protocol/key-concepts/what-is-semantic-sbts.md)
- [Social Graph](https://relationlabs.gitbook.io/protocol/key-concepts/social-graph.md)