Smart spaces define a development approach to creation of service-oriented information systems for computing environments of the Internet of Things (IoT). Semantic-driven resource sharing is applied to make fusion of the physical and information worlds based on the methods of ontology modeling. Knowledge from both worlds is selectively encompassed in the smart space to serve for users' needs. This paper considers several principles of the smart spaces approach to semantic-driven design of service-oriented information systems. Applying these principles the information system development achieves such properties as (a) involvement for service construction many surrounding devices and personal mobile devices of the user, (b) use of external Internet services and data sources for enhancing the constructed services, (c) information-driven programming of service construction based on resource sharing. The principles are explained using such application domains as collaborative work and cultural heritage environments.