The Yin/Yang web: XML syntax and RDF semantics
Proceedings of the 11th international conference on World Wide Web
EDBT '02 Proceedings of the Worshops XMLDM, MDDE, and YRWS on XML-Based Data Management and Multimedia Engineering-Revised Papers
RDF Aggregate Queries and Views
ICDE '05 Proceedings of the 21st International Conference on Data Engineering
Query-by-example: a data base language
IBM Systems Journal
The rule markup language: RDF-XML data model, XML schema hierarchy, and XSL transformations
INAP'01 Proceedings of the Applications of prolog 14th international conference on Web knowledge management and decision support
An RDF Query Language based on Logic Programming
Electronic Notes in Theoretical Computer Science (ENTCS)
Extending XQuery for semantic web reasoning
INAP'09 Proceedings of the 18th international conference on Applications of declarative programming and knowledge management
Growing triples on trees: an XML-RDF hybrid model for annotated documents
The VLDB Journal — The International Journal on Very Large Data Bases
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Metadata processing is recognized as a central challenge for database research in the next decade. Already, novel desktop data management and search applications (cf. Apple's Spotlight and Microsoft's WinFS) are enabled by rich metadata. Efficient and effective access to such data becomes a crucial issue for more and more application scenarios. In this article, we focus on metadata represented in RDF. A number of query languages for RDF have been presented in recent years. This article argues that most of these approaches fail to address properly two core issues: the provision of rich operators and constructs to adequately support RDF's graph data model and the ability to intertwine access to metadata (in RDF format) and data (in XML format). To address this points, two XML views over RDF data are expressed in the query language Xcerpt and discussed. Furthermore, it is shown how these views together with Xcerpt's rich graph patterns allow the succinct expression of complex, but common queries against RDF graphs.