Introduction / Paul Scarponcini, Styli Camateros, Oscar Custers, Sisi Zlatanova and Peter van Oosterom -- Ch. 1. Requirements and Challenges for Building a European Spatial Information Infrastructure: INSPIRE / Alessandro Annoni, Anders Friis-Christensen, Roberto Lucchi and Michael Lutz -- Ch. 2. Geometry Semantics in Spatial Information / John R. Herring, Jayant Sharma, Ravikanth V. Kothuri and Siva Ravada -- Ch. 3. Semantic Web Technologies as the Foundation for the Information Infrastructure / Frank van Harmelen -- Ch. 4. Standardization and Modeling of Transportation Infrastructure Semantics: Experience from GDF, TransXML, OPAL, and Framework / Paul Scarponcini -- Ch. 5. How Earth Science Can Contribute to and Benefit from the Spatial Information Infrastructure / Andrew Woolf and Stefano Nativi -- Ch. 6. Opportunities and Challenges in Exploiting Semantics as an Aid to Information Integration: A National Mapping Agency Perspective / Catherine Dolbear and Glen Hart -- Ch. 7. Using Formal Semantics for Services within the Spatial Information Infrastructure / Rob Lemmens -- Ch. 8. Geosemantic Web Standards for the Spatial Information Infrastructure: Nice to Have or Hopeless Without? / Joshua Lieberman and Chris Goad -- Ch. 9. A Standardized Land Administration Domain Model as Part of the (Spatial) Information Infrastructure / Arco Groothedde, Christiaan Lemmen, Paul van der Molen and Peter van Oosterom -- Ch. 10. Metadata and Spatial Searching as Key Spatial Information Infrastructure Component: Future Standardization Developments / Marcel Reuvers and Henri J. G. L. Aalders -- Ch. 11. The Spatial Information Infrastructure as Part of the Information Infrastructure / Bo Overgaard and Thorben Hansen