AIPREF Content-Usage Attachment vs AIPREF Vocabulary
Both belong to the AIPREF group on this map. The map lists them as complementary: sites and agents commonly implement both. AIPREF Vocabulary is a prerequisite of AIPREF Content-Usage Attachment. They share the acronym AIPREF but are unrelated protocols.
| AIPREF Content-Usage Attachment AIPREF | AIPREF Vocabulary AIPREF | |
|---|---|---|
| Lifecycle step | 3 Permit: What may the agent do here? | 3 Permit: What may the agent do here? |
| Answers | How does a publisher attach its AI-use preferences to content served over HTTP, so an automated system can find them? | What controlled set of values expresses a publisher's AI-use preferences, independent of how they are attached to content? |
| Governed by | IETF AI Preferences Working Group (ai-control@ietf.org mailing list) | IETF AI Preferences Working Group (ai-control@ietf.org mailing list) |
| Status (issuer's words) | Internet-Draft, work in progress; "About This Document" note says it is to be removed before publishing as an RFC | Internet-Draft, work in progress; explicitly states its contents 'DO NOT REFLECT CONSENSUS of the Working Group' |
| Phase | working group | working group |
| Version | draft-ietf-aipref-attach-05 (2026-08-19) | draft-ietf-aipref-vocab-08 (2026-09-14) |
| Form / transport | well-known file | document format |
| Found at | /robots.txt | Not independently discoverable; values are carried by the Content-Usage attachment mechanism (robots.txt directive or HTTP header) |
| Adoption | unmeasured | unmeasured |
| Evidence | 1 verified, 1 reported | 2 verified, 1 reported |
| Primary use case | Control AI crawling and training use | Control AI crawling and training use |
| Last verified | 2026-10-18 (current) | 2026-10-18 (current) |
| Specification | https://www.ietf.org/archive/id/draft-ietf-aipref-attach-05.html | https://datatracker.ietf.org/doc/html/draft-ietf-aipref-vocab-08 |
When to use which
- Choose AIPREF Content-Usage Attachment when your question is “How does a publisher attach its AI-use preferences to content served over HTTP, so an automated system can find them?” and you accept its maturity: phase working group, adoption unmeasured.
- Choose AIPREF Vocabulary when your question is “What controlled set of values expresses a publisher's AI-use preferences, independent of how they are attached to content?” and you accept its maturity: phase working group, adoption unmeasured.
Read the full articles
- AIPREF Content-Usage Attachment: How does a publisher attach its AI-use preferences to content served over HTTP, so an automated system can find them?
- AIPREF Vocabulary: What controlled set of values expresses a publisher's AI-use preferences, independent of how they are attached to content?
aipref-content-usage-attachment.json · aipref-vocabulary.json · Markdown