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The authors' view of environment for context-aware applications is a place, which contains devices, digital services and people with their social contexts. Therefore, understanding place will contribute to the successful of applications. In this paper, they introduce two issues: there is a need for sharing context knowledge about place; using a multi-agent framework for modeling place will improve the system scalability and robustness. To support the idea, they have built a tool called Sematic-PlaceBrowser for discovering place context and contributing to the knowledge base. The knowledge base can be shared and contributed among different applications. The Semantic-PlaceBrowser can be deployed at different scales, such as from a place as small as a room or as big as a shopping complex.
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