Jon Ekdahl developed a comprehensive OpenAPI 3.0.3 schema for the OSDM API in the UnionInternationalCheminsdeFer/OSDM repository, focusing on standardizing resources, paths, and components for transportation data such as places, trips, and bookings. He applied his expertise in API design, OpenAPI Specification, and schema definition, using YAML to ensure clarity and maintainability. Jon also addressed schema value quoting issues by backporting a solution to OpenAPI 3.0, resolving integration challenges for partners. His work provided a robust foundation for consistent API interactions, enabling faster onboarding and more reliable data exchange across transportation-related services within the project’s scope.