[...]... connection between software engineering and Semantic Web technologies 2 Peer-to-Peer The need for handling multiple sources of knowledge and information is quite obvious in the context of Semantic Web applications First of all we have the duality of schema and information content where multiple information sources can adhere to the same schema Further, the re-use, extension and combination of multiple schema... them This replaces the role of the single virtual database schema that is the traditional basis for solving information exchange problems 3 Aspects of Semantics-Based Peer-to-Peer Systems We have argued above that the combination of Semantic Web and P2P technologies is ideally suited to deal with the problem of knowledge sharing and knowledge Peer-to-Peer and Semantic Web 7 management, in particular... Semantic Web and Peer-to-Peer technologies These technologies address different aspects of the inherit complexity of information exchange Semantic Web Technologies address the problem of information complexity by providing advanced support for representing and processing information Peer-to-Peer technologies, on the other hand, address system complexity by allowing flexible and decentralized information. .. Local and Shared Meaning The aim of the Semantic Web is to make information on the World Wide Web more accessible using machine-readable meta-data In this context, the need for explicit models of semantic information (terminologies and background knowledge) in order to support information exchange has been widely acknowledged by the research community Several different ways of describing information semantics... complete semantics of data model In such cases only parts of the derivable answers can be queried Part I: RDF Data Storage & Access We adopt a Semantic Web perspective for data modelling and querying, i.e we see the need to represent and query conceptual information in a flexible and yet scalable manner because of the semantic heterogeneity of different peers Hence, the Peer-to-Peer and Semantic Web 9... present three successful Semantic Web and Peer-toPeer applications that make use of much of the technology presented in Chap 1 to 18, but in addition take care of • • • Users’ interface needs, Their organizational interactions and limitations, The processes that make up their information sharing and knowledge management tasks Peer-to-Peer and Semantic Web 15 Part IV: Methodology and Systems At an abstract... information storage and processing 1 The Semantic Web The World Wide Web today is a huge network of information resources, which was built in order to broadcast information for human users Consequently, most of the information on the Web is designed to be suitable for human consumption: The structuring principles are weak, many different kinds of information co-exist, and most of the information is represented... use and management of common representations Many applications have been developed, for instance in bio-informatics, or for knowledge management purposes inside Peer-to-Peer and Semantic Web 3 organizations Contexts, instead, are best used in those applications where the core problem is the use and management of local and autonomous representations with a need for a limited and controlled form of globalization... sophisticated ways of storing and accessing data These are based on the use of Semantic Web technologies in terms of languages for representing and querying semistructured data The focus of this book is on the use of RDF for data storage and access It is quite obvious that there are two sides to the use of RDF: the RDF model itself and its use for representing and storing complex information content, and the... literature, maintaining locality still guaranteeing semantic compatibility among representations) Examples of uses of contexts are the classifications of documents, distributed knowledge management, the development and integration of catalogs and semantics based Peer-to-Peer systems As a response to the need for representing shared models of web content, the Web ontology language OWL has been developed OWL, . alt="" Semantic Web and Peer-to-Peer SteffenStaab·HeinerStuckenschmidt(Eds.) Semantic Web and Peer-to-Peer Decentralized Management and Exchange of Knowledge and Information With 89 Figures and. between software engineer- ing and Semantic Web technologies. 2 Peer-to-Peer The need for handling multiple sources of knowledge and information is quite obvi- ous in the context of Semantic Web applications communi- cation and the only way to discover appropriate services and exchange meaningful content is to join Semantic Web and Peer-to-Peer. Hence, we invite you to ride the first wave of Semantic Web and Peer-to-Peer here