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Beyond XML and RDF

Benedikt Linse, Andreas Schroeder
2006 Proceedings of the 15th international conference on World Wide Web - WWW '06  
In contrast, Xcerpt is a versatile semi-structured query language, i.e., a query language able to access all kinds of Web data such as XML and RDF in the same language reusing common concepts and language  ...  Current main-stream Web query languages such as XQuery, XSLT, or SPARQL, however, focus only on one of the different data formats available on the Web.  ...  Furthermore, a type system [3] for Xcerpt is under development that eases error detection and recovery. (2) Novel evaluation methods for Xcerpt, enabled by high-level query constructs, are being investigated  ... 
doi:10.1145/1135777.1136011 dblp:conf/www/LinseS06 fatcat:gyq5n4bmv5alhiwfwu4he5voje

Effective and Efficient Data Access in the Versatile Web Query Language Xcerpt [chapter]

Sacha Berger, François Bry, Tim Furche, Benedikt Linse, Andreas Schroeder
2006 Lecture Notes in Computer Science  
Web query languages such as XQuery, XSLT, SPARQL, or Xcerpt have been tailored specifically for such a setting: declarative and efficient access and processing of Web data.  ...  Xcerpt stands apart among these languages by its versatility, i.e., its ability to access not just one Web format but many.  ...  Furthermore, a type system [3] for Xcerpt is under development that eases error detection and recovery. (2) Novel evaluation methods for Xcerpt, enabled by high-level query constructs, are being investigated  ... 
doi:10.1007/11853107_16 fatcat:giyoczz7tzchndp2frg2xzqaau

Marriages of Convenience: Triples and Graphs, RDF and XML in Web Querying [chapter]

Tim Furche, François Bry, Oliver Bolzer
2005 Lecture Notes in Computer Science  
To address this points, two XML views over RDF data are expressed in the query language Xcerpt and discussed.  ...  A number of query languages for RDF have been presented in recent years.  ...  This research has been funded by the European Commission and by the Swiss Federal Office for Education and Science within the 6th Framework Programme project REWERSE number 506779 (cf. http://rewerse.  ... 
doi:10.1007/11552222_8 fatcat:5k4kavx2traxtnazb5br3f3arq

Data Model and Query Constructs for Versatile Web Query Languages: State-of-the-Art and Challenges for Xcerpt [chapter]

François Bry, Tim Furche, Benedikt Linse
2006 Lecture Notes in Computer Science  
This article highlights challenges related to the data model and language constructs for querying both standard Web and Semantic Web data with an emphasis on facilitating sophisticated reasoning.  ...  A Web query language is called versatile if it can access in the same query program data in different formats (e.g. XML and RDF).  ...  This research has been funded by the European Commission and by the Swiss Federal Office for Education and Science within the 6th Framework Programme project REWERSE number 506779 (cf. http://rewerse.net  ... 
doi:10.1007/11853107_7 fatcat:wflb6fsovzhqlmkkjwqqgitvke

XML Querying Using Ontological Information [chapter]

Hans Eric Svensson, Artur Wilk
2006 Lecture Notes in Computer Science  
The solution presented in this paper is an extension of the declarative rule-based XML query and transformation language Xcerpt.  ...  The paper addresses the problem of using semantic annotations in XML documents for better querying XML data.  ...  KG 5 for ontology reasoning.  ... 
doi:10.1007/11853107_14 fatcat:thwimiochngpvflg52gs7pktne

Data Retrieval and Evolution on the (Semantic) Web: A Deductive Approach [chapter]

François Bry, Tim Furche, Paula-Lavinia Pătrânjan, Sebastian Schaffert
2004 Lecture Notes in Computer Science  
This article introduces into the (conventional and Semantic) Web query language Xcerpt and the event and update language XChange, and shows how their deductive capabilities make them well suited for querying  ...  To make use of data represented on the Semantic Web, it is necessary to provide languages for Web data retrieval and evolution.  ...  This research has been funded by the European Commission and by the Swiss Federal Office for Education and Science within the 6th Framework Programme project REWERSE number 506779 (cf. http://rewerse.net  ... 
doi:10.1007/978-3-540-30122-6_3 fatcat:77utfeoa2bbnlb3i7rhlrdiubq

Four Lessons in Versatility or How Query Languages Adapt to the Web [chapter]

François Bry, Tim Furche, Benedikt Linse, Alexander Pohl, Antonius Weinzierl, Olga Yestekhina
2009 Lecture Notes in Computer Science  
With Xcerpt we have developed a rule-and pattern based query language that aims to give shield application builders from much of this complexity: In a single query language XML and RDF data can be accessed  ...  in that they apply for querying XML and RDF in the same way. (3) We show that the resulting query language can be implemented reusing traditional database technology, if desirable.  ...  -Different types of variables. While Prolog Unification only allows for one single type of variable that will bind to any type of term, Xcerpt differentiates between different types of variables.  ... 
doi:10.1007/978-3-642-04581-3_2 fatcat:tyjxlcot7bgztckkzfw6vqq24m

Reuseware — Adding Modularity to Your Language of Choice

Jakob Henriksson, Jendrik Johannes, Steffen Zschaler, Uwe Aßmann
2007 Journal of Object Technology  
We walk through an example based on Xcerpt, a Semantic Web query language.  ...  Developers of such languages focus on their specific domains rather than on technical challenges of language design. Generic features of languages are rarely included in special-purpose languages.  ...  ACKNOWLEDGMENT This research has been co-funded by the European Commission and by the Swiss Federal Office for Education and Science within the 6th Framework Programme project REW-ERSE number 506779 (cf  ... 
doi:10.5381/jot.2007.6.9.a7 fatcat:slizci6bd5fc3exbs52gronsyi

The XML Query Language Xcerpt: Design Principles, Examples, and Semantics [chapter]

Francois Bry, Sebastian Schaffert
2003 Lecture Notes in Computer Science  
Most query and transformation languages developed since the mid 90es for XML and semistructured data -e.g.  ...  This paper further introduces into Xcerpt, a query and transformation language further developing an alternative approach to querying XML and semistructured data first introduced with the language UnQL  ...  The (current) view is that Xcerpt will support the "simple types" of XML Schema [14,15,16] including basics operations on these types (such as e.g. basic arithmetics on number types).  ... 
doi:10.1007/3-540-36560-5_22 fatcat:3kqce3cfbbe7jp23ttqdzmxecu

A Visual Language for Web Querying and Reasoning [chapter]

Sacha Berger, François Bry, Sebastian Schaffert
2003 Lecture Notes in Computer Science  
As XML is increasingly being used to represent information on the Web, query and reasoning languages for such data are needed.  ...  The constructs of the pattern-and rule-based query language Xcerpt are introduced and it is shown how the visual representation visXcerpt renders these constructs to form a visual query language for XML  ...  Related and Future Work There is a large number of XML query languages available on the Web, most of them based on a navigational selection of nodes.  ... 
doi:10.1007/978-3-540-24572-8_7 fatcat:omuoazds4ngixkb7zyi5swkaqu

Querying the Web Reconsidered

François Bry, Christoph Koch, Tim Furche, Sebastian Schaffert, Liviu Badea, Sacha Berger
2005 International Journal on Semantic Web and Information Systems (IJSWIS)  
This report identifies those design principles for a (possibly new) query and transformation language for the Web supporting inference that are considered essential.  ...  Abstract This report identifies those design principles for a (possibly new) query and transformation language for the Web supporting inference that are considered essential.  ...  We would like to thank Claude Kirchner and Wolfgang May for reviewing a draft of this deliverable and providing numerous invaluable comments on how to improve both its presentation and content.  ... 
doi:10.4018/jswis.2005040101 fatcat:lswujrluhrendahv2alku7eo6i

On Reasoning on Time and Location on the Web [chapter]

François Bry, Bernhard Lorenz, Hans Jürgen Ohlbach, Stephanie Spranger
2003 Lecture Notes in Computer Science  
Example: web-based appointment scheduling Three businessmen (one in London, one in Athens, and one in Tokyo) plan a phone conference to take place in the week after Easter. • temporal primitives in various  ...  Reasoning on Time and Location on the Web 9 Xcerpt: A Query Language for the Web Xcerpt (currently developed and tested on web-based systems at the Uni- versity of Munich): • logic-based query  ...  the Web • essential building block for the Web: query and transformation languages like the W3C recommendations XQuery and XSLT, and the logic-based language Xcerpt (ongoing research project) partitioning  ... 
doi:10.1007/978-3-540-24572-8_5 fatcat:mnuj7yfxqng2jjyrhyj5hmfmjq

Extending XML Query Language Xcerpt by Ontology Queries

Wlodzimierz Drabent, Artur Wilk
2007 IEEE/WIC/ACM International Conference on Web Intelligence (WI'07)  
The paper addresses a problem of combining XML querying with ontology reasoning. We present an extension of a rule-based XML query and transformation language Xcerpt.  ...  The extension allows to interface an ontology reasoner from Xcerpt programs. In this way querying can employ the ontology information, for instance to filter out semantically irrelevant answers.  ...  We propose a solution for XML query language Xcerpt [8, 7] and any ontology reasoner supporting a DIG interface.  ... 
doi:10.1109/wi.2007.128 dblp:conf/webi/DrabentW07 fatcat:5tgbg4ri6nhetmsesdh4r32beu

Web and Semantic Web Query Languages: A Survey [chapter]

James Bailey, François Bry, Tim Furche, Sebastian Schaffert
2005 Lecture Notes in Computer Science  
Three categories of Web query languages can be distinguished, according to the format of the data they can retrieve: XML, RDF and Topic Maps.  ...  This article introduces the spectrum of languages falling into these categories and summarises their salient aspects. The languages are introduced using common sample data and query types.  ...  that has been an important input for this overview.  ... 
doi:10.1007/11526988_3 fatcat:56l6wz2mtfefpgx3sn6o3k5l4m

AMa χ oS—Abstract Machine for Xcerpt: Architecture and Principles [chapter]

François Bry, Tim Furche, Benedikt Linse
2006 Lecture Notes in Computer Science  
Xcerpt is one such Web query language with strong emphasis on novel high-level constructs for effective and convenient query authoring, particularly tailored to versatile access to data in different Web  ...  Web query languages promise convenient and efficient access to Web data such as XML, RDF, or Topic Maps.  ...  Acknowledgments This research has been funded by the European Commission and by the Swiss Federal Office for Education and Science within the 6th Framework Programme project REWERSE number 506779 (cf.  ... 
doi:10.1007/11853107_8 fatcat:ncci6fg2crdn7k3xwj5uile3zm
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