We present the GI-Cat service: a SOAP-based Web service providing basic functionalities for GI dataset cataloguing and access. The GJ-Cat object model schema is instance of the hierarchical, semistructured data model and is based on the ISO 19115 data model. GI-Cat requirements, information model (resources and accompanying metadata) and functional modules are introduced. Some of the architectural and technological aspects of an experimental implementation of the service are briefly described. Eventually, we relate GI-Cat to OWS/spl trade/ specifications. The proposed solution is being currently experimented in the framework of the COS(OT) project, that is part of the Italian National Operating Program on Scientific and Technological Research and High Education.