This deliverable was developed by Silvia Weko and Johan Lilliestam (Sustainability Transition Policy Group, Friedrich-Alexander-Universität Erlangen-Nürnberg). Silvia Weko led the work, which was supported by Germán Bersalli, Ioannis Milioritsas, Aksornchan Chaianong, and Johan Lilliestam (Sustainability Transition Policy Group, Friedrich-Alexander-Universität Erlangen-Nürnberg). The deliverable is published with CC BY-SA 4.0. Please cite it as: Weko, S., Bersalli, G., Chaianong, A., Milioritsas, I., and Lilliestam, J. (2025): Draft Policy Ontology (Version 1, February 2025). Sustainability Transition Policy Group, Friedrich-Alexander-Universität Erlangen-Nürnberg. DOI: 10.5281/zenodo.15583093 The authors would like to thank the German Federal Government, the German State Governments, and the Joint Science Conference (GWK) for their funding and support as part of the NFDI4Energy consortium. The work was funded by the German Research Foundation (DFG) – 501865131 within the German National Research Data Infrastructure (NFDI, www.nfdi.de).