caa a22 4500 606229094 CHVBK 20210128101207.0 cr unu---uuuuu 210128e20150801xx s 000 0 eng 10.1007/s10796-013-9480-3 doi (NATIONALLICENCE)springer-10.1007/s10796-013-9480-3 VXQ: A visual query language for XML data [Elektronische Daten] [Ryan Choi, Raymond Wong] XML is the standard way of representing and storing rapidly-growing semi-structured data on the Internet. While XQuery has been proposed by W3C as the standard query language for XML data, the complexity of the language is the major overhead for users to express the queries and for software to process the queries efficiently. Considering mobile devices are more popular than desktop computers, expressing and/or processing XQuery becomes even more cumbersome on mobile devices. This paper proposes a visual XQuery specification language called VXQ. By intuitive abstractions of XML and XQuery, the proposed system can generate XQuery queries for users with little knowledge about XML and the language. The proposed visual language is easier to use and more expressive than previous proposals, and is also suitable for mobile devices where typing is not desired. Furthermore, we extend our proposed visual XQuery to support query rewriting and optimization for multiple XQuery systems. Experiments show that, in practice, our query rewriting reduces the query execution time significantly. Springer Science+Business Media New York, 2014 XML nationallicence XQuery nationallicence Query visualization nationallicence Mobile data nationallicence Choi Ryan KAIST, Daejeon, Republic of Korea aut Wong Raymond The University of New South Wales, Sydney, NSW, Australia aut Information Systems Frontiers Springer US; http://www.springer-ny.com 17/4(2015-08-01), 961-981 1387-3326 17:4<961 2015 17 10796 https://doi.org/10.1007/s10796-013-9480-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10796-013-9480-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Choi Ryan KAIST, Daejeon, Republic of Korea aut NATIONALLICENCE 700 1- Wong Raymond The University of New South Wales, Sydney, NSW, Australia aut NATIONALLICENCE 773 0- Information Systems Frontiers Springer US; http://www.springer-ny.com 17/4(2015-08-01), 961-981 1387-3326 17:4<961 2015 17 10796