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XQuery

Walmsley, Priscilla · CERN Document Server (European Organization for Nuclear Research) · 2007

Cited by 0

XQuery

Apress eBooks · 2008

The W3C defines the powerful XML Query (XQuery) language for querying XML data. SQL Server 2008 provides built-in support for XQuery via its xml data type methods. In this chapter, I will examine SQL Server’s XQuery implementation and support, including keywords, syntax, and the XQuery/XPath Data Model (XDM). As always, I’ll provide working examples to illustrate and highlight XQuery functionality along the way.KeywordsPath ExpressionContext NodeDocument NodeXQuery QueryAxis StepThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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XQuery

Donald D. Chamberlin · 2003

XQuery is the XML query language currently under development in the World Wide Web Consortium (W3C). XQuery specifications have been published in a series of W3C working drafts, and several reference implementations of the language are already available on the Web. If successful, XQuery has the potential to be one of the most important new computer languages to be introduced in several years. This tutorial will provide an overview of the syntax and semantics of XQuery, as well as insight into the principles that guided the design of the language.

Cited by 285

Active XQuery

Angela Bonifati, Daniele Braga, Alessandro Campi et al. · 2002

Besides being adopted as the new interchange format for the Internet, XML is finding increasing acceptance as a native data repository language. In order to make XML repositories fully equipped with data management capabilities, suitable query and update languages are being developed. However, once the user is allowed to perform updates, it is perceivably necessary to guarantee the correctness of his/her updates, especially if document validity or semantic constraints are violated. We address this problem by exploiting the well-grounded concept of active rules. In this paper, we propose Active XQuery, an active language for XML repositories that is based on a previously defined XQuery update model. In particular, we present the syntax and semantics of our language, aiming at emulating the trigger definition and execution model of SQL3. An active extension of XQuery arises nontrivial problems, related to the need of interleaving updates and triggers. These problems have led us to define an algorithm for update reformulation and to devise a compact semantics. In conclusion, the paper presents an architecture for rapid prototyping, and hints optimization and research issues. 1.

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XQuery Reloaded

Roger Bamford, Vinayak Borkar, Matthias Brantner et al. · 2009

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Distributed xquery

Christopher Re, James Brinkley · 2004

XQuery is increasingly being used for ad-hoc integration of heterogeneous data sources that are logically mapped to XML. For example, scientists need to query multiple scientific databases, which are distributed over a large geographic area, and it is possible to use XQuery for that. However, the language currently supports only the data shipping query evaluation model (through the document() function): it fetches all data sources to a single server, then runs the query there. This is a major limitation for many applications, especially when some data sources are very large, or when a data source is only a virtual XML view over some other logical data model. We propose here a simple extension to XQuery that allows query shipping to be expressed in the language, in addition to data shipping. Example 1.1 For a simple illustration, consider the following example:

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Active XQuery

Paraboschi, Stefano Giulio · Aisberg (University of Bergamo) · 2004

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XQuery Injection

Éric van der Vlist · Balisage series on markup technologies · 2011

We all know (and worry) about SQL injection, but should we also worry about XQuery injection? With the power of extension functions and the implementation of XQuery update features, the answer is clearly yes! We will see how an attacker can send information to an external site or erase a collection through XQuery injection on a naive and unprotected application using the eXist-db REST API. That's the bad news... The good news is that it's quite easy to protect your application from XQuery injection after this word of warning. We'll discuss a number of simple techniques (literal string escaping, wrapping values into elements or moving them out of queries in HTTP parameters) and see how to implement them in different environments covering traditional programming languages, XSLT, XForms and pipeline languages.

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XQuery algebra

Lukáš, Petr · DSpace VŠB-TUO (VŠB-TUO) · 2012

Cited by 0Open access

MonetDB/XQuery

Peter Boncz, Torsten Grust, Maurice van Keulen et al. · University of Twente Research Information · 2006

Relational XQuery systems try to re-use mature relational data management infrastructures to create fast and scalable XML database technology. This paper describes the main features, key contributions, and lessons learned while implementing such a system. Its architecture consists of (i) a range-based encoding of XML documents into relational tables, (ii) a compilation technique that translates XQuery into a basic relational algebra, (iii) a restricted (order) property-aware peephole relational query optimization strategy, and (iv) a mapping from XML update statements into relational updates. Thus, this system implements all essential XML database functionalities (rather than a single feature) such that we can learn from the full consequences of our architectural decisions. While implementing this system, we had to extend the state-of-the-art with a number of new technical contributions, such as loop-lifted staircase join and efficient relational query evaluation strategies for XQuery theta-joins with existential semantics. These contributions as well as the architectural lessons learned are also deemed valuable for other relational back-end engines. The performance and scalability of the resulting system is evaluated on the XMark benchmark up to data sizes of 11GB. The performance section also provides an extensive benchmark comparison of all major XMark results published previously, which confirm that the goal of purely relational XQuery processing, namely speed and scalability, was met.

Cited by 294Open access

Active XQuery

Angela Bonifati, Daniele Braga, Alessandro Campi et al. · 2003

Besides being adopted as the new interchange format for the Internet, XML is finding increasing acceptance as a native data repository language. In order to make XML repositories fully equipped with data management capabilities, suitable query and update languages are being developed. However, once the user is allowed to perform updates, it is perceivably necessary to guarantee the correctness of his/her updates, especially if document validity or semantic constraints are violated. We address this problem by exploiting the well-grounded concept of active rules. In this paper, we propose Active XQuery, an active language for XML repositories that is based on a previously defined XQuery update model. In particular, we present the syntax and semantics of our language, aiming at emulating the trigger definition and execution model of SQL3. An active extension of XQuery results in nontrivial problems, related to the need of interleaving updates and triggers. These problems have led us to define an algorithm for update reformulation and to devise a compact semantics. In conclusion, the paper presents an architecture for rapid prototyping, and considers optimization and research issues.

Cited by 72

XPath/XQuery

Jan Hidders, Jan Paredaens · Encyclopedia of Database Systems · 2018

Cited by 0

Growing XQuery

Mary Fernández, Jérǒme Simèon · Lecture notes in computer science · 2003

Cited by 2

Growing XQuery

Mary Fernández, Jérôme Siméon · 2003

XML [39] is a flexible format that can represent many classes of data: structured documents with large fragments of marked-up text; homogeneous records such as those in relational databases; and heterogeneous records with varied structure and content such as those in object-oriented and hierarchical databases.

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XQuery layers

BRAGA, DANIELE MARIA, CAMPI, ALESSANDRO, CERI, STEFANO et al. · Virtual Community of Pathological Anatomy (University of Castilla La Mancha) · 2007

Cited by 0

XPath/XQuery

Hidders, AJH Jan, Paredaens, J Jan · TU/e Research Portal (Eindhoven University of Technology) · 2009

Cited by 0

XQuery Interpreter

Ling Liu, M. TAMER ÖZSU · Encyclopedia of Database Systems · 2009

Cited by 0

Active XQuery

Angela Bonifati, Daniele Braga, Alessandro Campi et al. · 2002

Besides being adopted as the new interchange format for the Internet, XML is finding increasing acceptance as a native data repository language. In order to make XML repositories fully equipped with data management capabilities, suitable query and update languages are being developed. However, once the user is allowed to perform updates, it is perceivably necessary to guarantee the correctness of his/her updates, especially if document validity or semantic constraints are violated. We address this problem by exploiting the well-grounded concept of active rules. In this paper, we propose Active XQuery, an active language for XML repositories that is based on a previously defined XQuery update model. In particular, we present the syntax and semantics of our language, aiming at emulating the trigger definition and execution model of SQL3. An active extension of XQuery arises nontrivial problems, related to the need of interleaving updates and triggers. These problems have led us to define an algorithm for update reformulation and to devise a compact semantics. In conclusion, the paper presents an architecture for rapid prototyping, and hints optimization and research issues. 1.

Cited by 0

XPath/XQuery

Jan Hidders · VUBIR (Vrije Universiteit Brussel) · 2018

Cited by 0

Fuzzy XQuery

José Ángel Labbad, Ricardo R. Monascal, Leonid Tineo · Advances in data mining and database management book series · 2015

Traditional database systems and languages are very rigid. XML data and query languages are not the exception. Fuzzy set theory is an appropriate tool for solving this problem. In this sense, Fuzzy XQuery was proposed as an extension of the XQUERY standard. This language defines the xs:truth datatype, the xml:truth attribute and allows the definition and use of fuzzy terms in queries. The main goal of this chapter is to show a high coupling implementation of Fuzzy XQuery within eXist-db, an open source XML DBMS. This extension strategy could also be used with other similar tools. This chapter also presents a statistical performance analysis of the extended fuzzy query engine using the XMark benchmark with user defined fuzzy terms. The study presents promising results.

Cited by 1