Interoperability: Invited Contributions -- Mediation to Deal with Heterogeneous Data Sources -- OpenGIS: Tales from a Small Market Town -- Evolution of EO/GIS Interoperability towards an Integrated Application Infrastructure -- Identification -- Feature Identities, Descriptors, and Handles -- A Global Unique Persistent Object ID for Geospatial Information Sharing -- Infrastructure -- Implementation Architecture for a National Data Center -- Architecture Considerations for Advanced Earth Observation Application Systems -- A Spatial Data Infrastructure for the Hindu Kush – Himalayan Region: -- Interoperability for GIScience Education -- Implementation -- Adding an Interoperable Server Interface to a Spatial Database: Implementation Experiences with OpenMapTM -- Interoperability in Practice: Problems in Semantic Conversion from Current Technology to OpenGIS -- Building a Prototype OpenGIS® Demonstration from Interoperable GIS Components -- Vectors and Graphics -- Modeling and Sharing Graphic Presentations of Geospatial Data -- Towards OpenGIS Systems -- Semantics -- Semantic and Geometric Aspects of Integrating Road Networks -- Assessing Semantic Similarities among Geospatial Feature Class Definitions -- Proceeding on the Road of Semantic Interoperability – Design of a Semantic Mapper Based on a Case Study from Transportation -- What Are Sports Grounds? -- Heterogeneous Databases -- Identifying Semantically Similar Elements in Heterogeneous Spatial Databases Using Predicate Logic Expressions -- Designing a Mediator for Managing Relationships between Distributed Objects -- Geospatial Mediator Functions and Container-Based Fast Transfer Interface in Si3CO Test-Bed -- Plug and Play: Interoperability in Concert -- Representation -- Functional Extensions of a Raster Representation for Topological Relations -- 3D Synthetic Environment Representation Using the “Non-Manifold 3D Winged-Edge” Data Structure -- Pluggable Terrain Module – Moving Digital Terrain Modelling to a Distributed Geoprocessing Environment.