D3.1 EOSC Data Commons architecture, functional specifications no.1

This deliverable presents the initial architecture and functional specifications of the EOSC Data Commons, a federated framework enabling AI-enhanced discovery, access, analysis, and reuse of research data across distributed repositories and compute environments. It outlines the architectural vision, requirements, principles, and decision processes that guide the design of the two core services: the EOSC Matchmaker, which integrates heterogeneous metadata, supports discovery and pairs datasets with analytical tools; and the EOSC Data Player, which orchestrates data access, provisioning, and workflow execution across the compute continuum. The document provides a detailed description of the components, interfaces, and interoperability mechanisms that underpin these services, and establishes the foundation for their first integrated release and future evolution within the EOSC ecosystem.