A query language for a Web-site management system
ACM SIGMOD Record
CAiSE '02 Proceedings of the 14th International Conference on Advanced Information Systems Engineering
A Spatial Logic for Querying Graphs
ICALP '02 Proceedings of the 29th International Colloquium on Automata, Languages and Programming
UnQL: a query language and algebra for semistructured data based on structural recursion
The VLDB Journal — The International Journal on Very Large Data Bases
XDuce: A statically typed XML processing language
ACM Transactions on Internet Technology (TOIT)
CDuce: an XML-centric general-purpose language
ICFP '03 Proceedings of the eighth ACM SIGPLAN international conference on Functional programming
XPath-logic and XPathLog: A logic-programming style XML data manipulation language
Theory and Practice of Logic Programming
TQL: a query language for semistructured data based on the ambient logic
Mathematical Structures in Computer Science
Web and semantic web query languages: a survey
Proceedings of the First international conference on Reasoning Web
A pattern-based temporal XML query language
WISE'10 Proceedings of the 11th international conference on Web information systems engineering
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To extract and restructure information in XML documents, various query languages have been proposed in the past decade. These languages take navigational or pattern-based approach to data extraction and often claim to be declarative. However, declarativeness in them is not as prominent as in SQL because they often exhibit a procedural style in handling heterogeneity and presenting tree-like document structure. In this paper, a new XML query language called XTQ is proposed to address this challenge. XTQ is a pattern-based language which introduces disjunction as well as conjunction operators in composing treelike patterns named LXT (Logic XML Tree) for data extraction. LXT can expressively handle heterogeneity common in XML queries. Based on a hierarchically structured pattern with considerate restructuring rules, XTQ deploys a flexible hierarchically grouping mechanism in data construction so that complex tree-like structure can be intuitively presented. Examples from common query request show that XTQ can present XML queries more declaratively than existing studies.