Verisav Vocabularies: RDF/OWL Ontologies for Digital Product Passport and After-Sales Service Automation

The European Union's Ecodesign for Sustainable Products Regulation (ESPR 2024/1781) mandates Digital Product Passports (DPP) for electronics and appliances by 2027. This paper presents three interconnected RDF/OWL vocabularies addressing a critical gap: after-sales service automation. The DPP vocabulary (35 classes, approximately 90 properties) covers product lifecycle traceability; the RMA vocabulary (8 classes, approximately 50 properties) standardizes return merchandise authorization workflows; and the WTY vocabulary (9 classes, approximately 50 properties) enables machine-readable warranty contracts. The key innovation is the wty:PaymentRule construct, which formally specifies warranty payment decisions—functionality absent from existing vocabularies including GoodRelations, Schema.org, and DPPO. All vocabularies are registered in Linked Open Vocabularies (LOV), validated by independent curator Ghislain Atemezing, use W3ID persistent URIs, and are published under CC BY 4.0. This work provides essential semantic infrastructure for EU DPP implementation.