Extended Data: PA/HAL Data Systems, Standards, Infrastructures, and Tools

Extended Data for: Zacharis T. Physical Activity (PA) and Healthy Ageing & Longevity Data (HAL): Interoperability, Reuse, and Innovation in a Federated European Context. Open Research Europe. 2026. This document provides a reference overview of the data systems, standards, infrastructures, and tools referenced in the main analysis, organised across the seven layers of the interoperability stack: (A) cataloguing and dataset discovery; (B) metadata standards and research object packaging; (C) semantics — terminologies, vocabularies, and ontologies; (D) provenance, traceability, and workflow standards; (E) access, governance, and secondary-use mechanisms; (F) computability, federation, and compute-to-data; and (G) PA/HAL data capture and study operations platforms.