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
tolog – a topic maps query language
TMRA'05 Proceedings of the First international conference on Charting the Topic Maps Research and Applications Landscape
TM/XML – topic maps fragments in XML
TMRA'05 Proceedings of the First international conference on Charting the Topic Maps Research and Applications Landscape
Web and semantic web query languages: a survey
Proceedings of the First international conference on Reasoning Web
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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XQuery is a query language designed to allow queries across the many kinds of information that are represented in XML. Although topic maps and RDF can also be represented in XML, many have held that their many possible syntactic forms make them extremely difficult to query using an XML query language, and that they can only be queried using special-purpose query languages with built-in knowledge of their semantics, including the ability to exploit RDF schema information. This talk shows that XQuery can, in fact, be used to solve the kinds of queries for which RDF and topic map query languages were designed, though with a loss of type safety.The approach taken is to transform instances of RDF and topic maps to a syntactic representation that closely models their underlying logical models, and to use function libraries written in XQuery to directly support operations specific to RDF or topic maps. Schema-level information is also incorporated in this representation and is supported in the library, so queries can exploit type hierarchies and perform joins across predicates.Information from other XML sources can also be queried together with information from topic maps and RDF. For instance, a query on a topic map that searches for Shakespeare plays mentioned in Italian operas can also query the plays themselves - represented in XML - to determine which italian cities are mentioned in them.