This book constitutes the refereed proceedings of the 5th International Workshop on Databases in Networked Information Systems, DNIS 2007, held in Aizu-Wakamatsu, Japan in October 2007. Focusing on data semantics and infrastructure for information management and interchange, the papers are organized in topical sections on geospatial decision-making, Web data management systems, infrastructure of networked information systems, and Web query and web mining systems.

Geospatial Decision-Making.- Location Privacy in Geospatial Decision-Making.- Geometrical Information Fusion from WWW and Its Related Information.- A Semantic and Structural Similarity Approach to Personalize Location-Based Services.- Exploring Structural and Dimensional Similarities Within-Lunar Nomenclature System Using Query Interfaces.- Semantic Tracking in Peer-to-Peer Topic Maps Management.- Web Data Management Systems.- Going Beyond Completeness in Information Retrieval.- Query and Update Through XML Views.- A Formalism for Navigating and Editing XML Document Structure.- SSRS-An XML Information Retrieval System.- Readability Factors of Japanese Text Classification.- Differences and Identities in Document Retrieval in an Annotation Environment.- Networked Information Systems: Infrastructure.- Towards Scalable Architectures for Clickstream Data Warehousing.- Localized Mobility-Aware Geometric Graphs for Topology Control in Heterogeneous Mobile Ad Hoc Networks.- Using SCTP to Implement Multihomed Web Servers.- Improving the Performance of Read-Only Transactions Through Speculation.- LEASE: An Economic Approach to Leasing Data Items in Mobile-P2P Networks to Improve Data Availability.- Real-Time Event Handling in an RFID Middleware System.- Web Query and Web Mining Systems.- Sustainable Creation of Conversational Content Using Conversation Quantization.- Understanding the Dynamics of Crop Problems by Analyzing Farm Advisory Data in eSagu TM .- Adaptive Query Interface for Mining Crime Data.- Aizu-BUS: Need-Based Book Recommendation Using Web Reviews and Web Services.- Search in Virtual and Study in Real: A Ubiquitous Query/Answer System.- Building a Scalable Web Query System.