Your mediators need data conversion!
SIGMOD '98 Proceedings of the 1998 ACM SIGMOD international conference on Management of data
BUS: an effective indexing and retrieval scheme in structured documents
Proceedings of the third ACM conference on Digital libraries
WWW '99 Proceedings of the eighth international conference on World Wide Web
Comparative analysis of five XML query languages
ACM SIGMOD Record
Integrating keyword search into XML query processing
Proceedings of the 9th international World Wide Web conference on Computer networks : the international journal of computer and telecommunications netowrking
WHIRL: a word-based information representation language
Artificial Intelligence - Special issue on Intelligent internet systems
Expressive retrieval from XML documents
Proceedings of the 24th annual international ACM SIGIR conference on Research and development in information retrieval
Modern Information Retrieval
Microsoft SQL Server 2000 Resource Kit
Microsoft SQL Server 2000 Resource Kit
An XML Indexing Structure with Relative Region Coordinate
Proceedings of the 17th International Conference on Data Engineering
DataGuides: Enabling Query Formulation and Optimization in Semistructured Databases
VLDB '97 Proceedings of the 23rd International Conference on Very Large Data Bases
Quilt: An XML Query Language for Heterogeneous Data Sources
Selected papers from the Third International Workshop WebDB 2000 on The World Wide Web and Databases
Selected papers from the Third International Workshop WebDB 2000 on The World Wide Web and Databases
An Efficiently Updatable Index Scheme for Structured Documents
DEXA '98 Proceedings of the 9th International Workshop on Database and Expert Systems Applications
Hi-index | 0.00 |
Web is characterized by a huge amount of very heterogeneous data sources, that differ both in media support and format representation. In this scenario, there is the need of an integrating approach for querying heterogeneous Web documents. To this purpose, XML can play an important role since it is becoming a standard for data representation and exchange over the Web. Due to its flexibility, XML is currently being used as an interface language over the Web, by which (part of) document sources are represented and exported. Under this assumption, the problem of querying heterogeneous sources can be reduced to the problem of querying XML data sources. In this chapter, we first survey the most relevant query languages for XML data proposed both by the scientific community and by standardization committees, e.g., W3C, mainly focusing on their expressive power. Then, we investigate how typical Information Retrieval concepts, such as ranking, similarity-based search, and profile-based search, can be applied to XML query languages. Commercial products based on the considered approaches are then briefly surveyed. Finally, we conclude the chapter by providing an overview of the most promising research trends in the fields.