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+# 38. Allow URI's for Product Identifiers
+
+Date: 2024-09-11
+
+## Status
+
+Proposed
+
+This is an expansion of the common URN format introduced by ADR-0034. The proposal is ready for review, following consultation with GS1, Digital Twin and being presented in the PACT Tech WG September 11.
+
+
+## Context
+
+
+
+The current PACT Technical Specifications mandate the use of Uniform Resource Names (URNs) for product identification and classification, and include a recommended `urn:pact` namespace with a common format for specifying product ids. 
+
+For most point-to-point cases this default, recommended way of using id's will suffice. However, there is a need to accommodate emerging standards like Digital Link and Digital Product Passport, which rely on Uniform Resource Identifiers (URIs), a superset of URNs.
+
+
+https://gs1.eu/activities/digital-product-passport/gs1-data-architecture-for-the-dpp/  
+https://ref.gs1.org/standards/digital-link/uri-syntax/  
+
+This ADR proposes expanding from URNs to URIs for product identification within the PACT Technical Specifications.
+
+### Specific problems this proposal addresses 
+ The PACT Technical Specification will be revised to use URIs for product identification, replacing the current requirement for URNs. This change will:
+ * Expand Compatibility: Allow for the integration of emerging and future product identification standards, such as Digital Link and Digital Product Passport.
+ * Enhance Interoperability: Improve compatibility with various identifier schemes and systems used by different organizations and industry networks.
+ * Future-Proofing: Ensure the PACT specification remains adaptable to evolving digitalization trends in supply chain sustainability and circular economy.
+
+Scope 
+ * The scope of this proposal is for product identifiers `productIDs` *and* product *classification* identifiers as stored in `productClassification` (see ADR-0037). 
+ 
+
+## Proposal
+
+The proposal consists of three recommendations:
+ 1. Change the data type of `productIDs` from URN to **URI** (as defined in RFC 3986)
+ 1. Change the data type of `productClassification` from *array* or URN to *array* of **URI** 
+ 1. Include additional examples for real-world URI's in the documentation
+
+ ### Examples
+
+ GS1 Digital Link
+
+    https://qr.patagonia.com/01/00889833298392/21/000000001842
+    
+
+## Consequences
+
+ * Inclusion of v3 ensures backwards compatibility with v2.x URNs.