Complex queries in XML-GL

Complex queries in XML-GL Complex Queries in XML-GL S. Ceri, S. Comai Politecnico di Milano Dipartirnento di Elettronica e Informazione Rzza L. da Vinci, 32 E. Damiani Universit& di Milano Polo di Crema Via Bramante, 65 - Crema (CR) R Fraternali, L. Tanca Politecnico di Milano Dipartimento di Elettronica e Informazione Rzza L. da Vinci, 32 ceri,comai@elet.polimi.it ABSTRACT edamiani¢crema.unimi.it fraterna,tanca@elet.polimi.it In this paper we describe the advanced features of XML-GL, a graphical query language over XML data which enables the retrieval and restructuring of XML documents in a simple and intuitive way. After a summary of the basic features on the language, we focus on complex queries, whose expressive power subsumes some well-known relational operations (e.g. union, difference, cartesian product) but goes well beyond from these relatively simple operators. K e y w o r d s : XML, query languages, graphical languages, WWW The graphs on the right hand side (KHS) dictate which elements retrieved in the LHS should appear in the result, and construct or restructure the information to be produced as output. The strong points of the XML-GL proposal are the following: ¢ T h e DTD of a document collection can also be represented as a graph which http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Complex queries in XML-GL

Association for Computing Machinery — Mar 1, 2000

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Datasource
Association for Computing Machinery
Copyright
Copyright © 2000 by ACM Inc.
ISBN
1-58113-240-9
doi
10.1145/338407.338677
Publisher site
See Article on Publisher Site

Abstract

Complex Queries in XML-GL S. Ceri, S. Comai Politecnico di Milano Dipartirnento di Elettronica e Informazione Rzza L. da Vinci, 32 E. Damiani Universit& di Milano Polo di Crema Via Bramante, 65 - Crema (CR) R Fraternali, L. Tanca Politecnico di Milano Dipartimento di Elettronica e Informazione Rzza L. da Vinci, 32 ceri,comai@elet.polimi.it ABSTRACT edamiani¢crema.unimi.it fraterna,tanca@elet.polimi.it In this paper we describe the advanced features of XML-GL, a graphical query language over XML data which enables the retrieval and restructuring of XML documents in a simple and intuitive way. After a summary of the basic features on the language, we focus on complex queries, whose expressive power subsumes some well-known relational operations (e.g. union, difference, cartesian product) but goes well beyond from these relatively simple operators. K e y w o r d s : XML, query languages, graphical languages, WWW The graphs on the right hand side (KHS) dictate which elements retrieved in the LHS should appear in the result, and construct or restructure the information to be produced as output. The strong points of the XML-GL proposal are the following: ¢ T h e DTD of a document collection can also be represented as a graph which

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