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,firstname.lastname@example.org ABSTRACT edamianiÂ¢crema.unimi.it fraterna,email@example.com 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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