The understanding of data semantics in Web-based information systems is the object of intensive research e?orts. The large volume of data on the Internet originatesaneedforaccessingthesemanticcontentofthatinformation. Furth- more, it requires the personalizing of its search and integration to various types of users. Two approacheshave been proposed in the research literature: integ- tion of Web technologies with database technologies and use of meta-languages such as XML. These solutions o?er highly structured or semi-structured data that allow users to perform queries at a higher semantic level. These also faci- tate thedynamic personalizationof Web-basedapplications. Therefore,it is now important to address the question of how one can e?ciently query and search large collections of XML documents. And it is also necessary to ?nd new so- tions, both to support dynamic architectures for Web-based applications and to model users’ search and result presentation criteria. The third international workshop on Databases in Networked Information S- tems (DNIS 2003) was held on September 22–24, 2003 at the University of Aizu in Japan on the occasion of its 10th anniversary. The workshop program included research contributions, and invited contributions. The session on Web IntelligenceincludedinvitedpapersbyProfessorJimingLiuandProfessorCyrus Shahabi. The session on Information Interchange and Management Systems - cluded invited papers by Professor Tosiyasu L. Kunii, Professor Elisa Bertino, and ProfessorMarc Sifer. The session on Information Interchange Among Cyber CommunitieshadinvitedpapersbyProfessorToyoakiNishida,ProfessorMasaru Kitsuregawa,and Dr. Umeshwar Dayal. Finally the session onKnowledge – - notation and Visualization included theinvited contributionby ProfessorDaniel Keim.