ABSTRACT
In a rapidly digitizing urban world, the exchange of planning information demands interoperability, precision, and legal fidelity. Germany's nationwide standard XPlanung, overseen by the XLeitstelle Planen und Bauen at Hamburg's State Office for Geoinformation and Surveying, provides a structured data model and exchange format for urban land use, spatial, and landscape planning. Complemented by XBau—a modular messaging standard for building permits—XPlanung fosters machine-readable geodata within the planning-to-construction pipeline. Since the IT Planning Council (IT-Planungsrat) mandated these standards in October 2017, federal and state (Länder) administrations have had until February 2023 to implement them. Hamburg's deployment of approximately 3,000 development plans via Open Geospatial Consortium-compliant web services and the Urban Data Platform illustrates the standard's practical value. At the same time, Projekt PlanDigital in Niedersachsen exemplifies the scalability of XPlanung, addressing cross-municipal harmonization and legacy data integration. Drawing on international geospatial standards, this chapter offers a comprehensive view of XPlanung's technical foundations, governance structures, operational progress, and its potential as a blueprint for digital planning ecosystems worldwide.
