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+---
+title: 'The "dpp" link relation (Digital Product Passport)'
+date: "2026-08-01"
+reason: too-early
+revisit: "A product page on the open web advertising its passport directly — an HTTP `Link` header or a `<link rel=\"dpp\">` in the document — rather than only a resolver behind a QR code. ESPR delegated acts for textiles, footwear or batteries requiring a web-discoverable passport would produce that quickly."
+sources:
+  - title: "IANA Link Relation Types registry — dpp"
+    url: "https://www.iana.org/assignments/link-relations/link-relations.xhtml"
+    publisher: "IANA"
+  - title: "UN Transparency Protocol — Identity Resolver"
+    url: "https://untp.unece.org/docs/specification/IdentityResolver/"
+    publisher: "UNECE"
+  - title: "RFC 9264 — Linkset: Media Types and a Link Relation Type for Link Sets"
+    url: "https://www.rfc-editor.org/rfc/rfc9264.html"
+    publisher: "IETF"
+---
+
+IANA has registered `dpp` as a link relation type: "a link from a context URI that identifies a product to its digital product passport", on the authority of the UN Transparency Protocol. A Digital Product Passport is the machine-readable record of a product's materials, provenance and sustainability data that EU Ecodesign regulation will require for a widening list of categories, starting with textiles, footwear and batteries in 2026–2027. Three separate signals arrived within a few months of each other: the IANA registration, schema.org 30.0 adding EU Digital Product Passport examples aligned to UN/CEFACT codes, and the UNECE/ISO joint initiative. On the face of it that looks like a topic arriving.
+
+The problem is where the link actually lives. UNTP does not put `rel="dpp"` on the product's web page. It puts it in a **linkset** — RFC 9264, the same media type this spec already covers under [the api-catalog](/spec/well-known/api-catalog/) — returned by an identity resolver, extending the GS1 Digital Link resolver schema. The context URI is a GS1 product identifier, the client is a scanner following a QR code on physical packaging, and the passport itself comes back as a verifiable credential. None of that is a property of a website. A spec page here would have to recommend that ordinary product pages emit a `Link: <…>; rel="dpp"` header, and nobody is doing that, because the protocol does not ask them to.
+
+So this is not the usual too-early case of a good header nothing reads yet. It is a registered relation that is genuinely in use, in a place this spec does not describe. That could change: the regulation lands on manufacturers who already run product pages, and the cheapest way to make a passport discoverable to a crawler rather than a barcode scanner is to advertise it from the page. If that becomes the convention, it is a page — and the [`Link` header](/spec/agent-readiness/link-headers/) and [structured data](/spec/seo/structured-data/) topics are where it would connect.