Presentation for the working group Ontology Harmonization of the memorandum of understanding-group of NFDI consortia held on February 10th 2025. Our presentation gives: an overview of the status quo in Text+ towards ontology harmonization, contributions of Text+ to such activities within the NFDI, a technical introduction into the Text+ Registry as a service, and an introduction into the editions data model as data domain-specific implementation, as example for this scalability of the registry. Executive summary Text+ consortium (and infrastructure) as locally distributed RI with a strong family tree of institutions distinguishing themselves with established services (search & retrieval) and resources (repositories) (=federated data and metadata infrastructure) Text+ Registry as THE means to provide overview and access to the resources of the data partners, and thus the infrastructure component to harvest for overall NFDI services focus on the Integrated Authority File (GND) as means for enrichment of research data References Text+ Architecture: https://text-plus.org/ueber-uns/architektur/ feedback always welcome via the helpdesk Text Registry: https://registry.text-plus.org/ Drop an issue for the Text+ Registry: https://gitlab.gwdg.de/groups/textplus/registry/-/issues/ Schulz, D. (2024, September 7). Cataloguing editions and other resources in one unified system. The Text+ Registry. Digital Humanities Congress 2024 (DHC 2024), Sheffield. Zenodo. https://doi.org/10.5281/zenodo.13729849 Gradl, T., Kudella, C., Lordick, H., Schulz, D. Towards a Registry for Digital Resources – The Text+ Registry for Editions. Datenbank Spektrum 24, 151–160 (2024). https://doi.org/10.1007/s13222-024-00479-0