UnQL: a query language and algebra for semistructured data based on structural recursion

Buneman, Peter; Fernández, Mary; Suciu, Dan

doi:10.1007/s007780050084

Cited by 179 publications

(266 citation statements)

References 27 publications

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“…UnQL [21] first proposed to express queries as terms (or patterns) as in logic and in the present paper. Such query languages can be called "positional" because the relative positions of the data to retrieve, e.g.…”

Section: Related Workmentioning

confidence: 99%

An Entailment Relation for Reasoning on the Web

Bry¹,

Schaffert²

2003

Rules and Rule Markup Languages for the Semantic Web

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Abstract. Reasoning on the Web is receiving an increasing attention because of emerging fields such as Web adaption and Semantic Web. Indeed, the advanced functionalities striven for in these fields call for reasoning capabilities. Reasoning on the Web, however, is usually done using existing techniques rarely fitting the Web. As a consequence, additional data processing like data conversion from Web formats (e.g. XML or HTML) into some other formats (e.g. classical logic terms and formulas) is often needed and aspects of the Web (e.g. its inherent inconsistency) are neglected. This article first gives requirements for an entailment tuned to reasoning on the Web. Then, it describes how classical logic's entailment can be modified so as to enforce these requirements. Finally, it discusses how the proposed entailment can be used in applying logic programming to reasoning on the Web.

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Section: Related Workmentioning

confidence: 99%

An Entailment Relation for Reasoning on the Web

Bry¹,

Schaffert²

2003

Rules and Rule Markup Languages for the Semantic Web

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“…For querying semistructured data, the positional approach has been suggested first with UnQL [4] and XML-QL [11]. In common programming, the positional approach finds its roots in Functional and Logic Programming.…”

Section: Positional Vs Navigational Data Selectionmentioning

confidence: 99%

“…In contrast, some other languages -such as UnQL [4] and Xcerpt [5] -are pattern-based: their variable binding paradigm is that of mathematical logics, i.e. the programmer specifies patterns (or terms) including variables.…”

Section: Introductionmentioning

confidence: 99%

A Visual Language for Web Querying and Reasoning

Berger

Bry

Schaffert

2003

Principles and Practice of Semantic Web Reasoning

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Abstract. As XML is increasingly being used to represent information on the Web, query and reasoning languages for such data are needed. This article argues that in contrast to the navigational approach taken in particular by XPath and XQuery, a positional approach as used in the language Xcerpt is better suited for a straightforward visual representation. The constructs of the pattern-and rule-based query language Xcerpt are introduced and it is shown how the visual representation visXcerpt renders these constructs to form a visual query language for XML.

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“…Among the query and transformation languages, UnQL [4] is a noticeable exception. This language first considered using patterns instead of paths for querying semistructured data.…”

Section: Introductionmentioning

confidence: 99%

“…Constructs inspired from the regular expression constructs * , +, ?, and "wildcards" give rise to a flexible node retrieval from incompletely specified data items. This paper further introduces into Xcerpt, a query and transformation language further developing an alternative approach to querying XML and semistructured data first introduced with the language UnQL [4]. A metaphor for this approach views queries as patterns, answers as data items matching the queries.…”

mentioning

confidence: 99%

The XML Query Language Xcerpt: Design Principles, Examples, and Semantics

Bry¹,

Schaffert²

2003

Web, Web-Services, and Database Systems

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Abstract. Most query and transformation languages developed since the mid 90es for XML and semistructured data -e.g. XQuery [1], the precursors of XQuery [2], and XSLT [3] -build upon a path-oriented node selection: A node in a data item is specified in terms of a root-to-node path in the manner of the file selection languages of operating systems. Constructs inspired from the regular expression constructs * , +, ?, and "wildcards" give rise to a flexible node retrieval from incompletely specified data items. This paper further introduces into Xcerpt, a query and transformation language further developing an alternative approach to querying XML and semistructured data first introduced with the language UnQL [4]. A metaphor for this approach views queries as patterns, answers as data items matching the queries. Formally, an answer to a query is defined as a simulation [5] of an instance of the query in a data item.

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UnQL: a query language and algebra for semistructured data based on structural recursion

Cited by 179 publications

References 27 publications

An Entailment Relation for Reasoning on the Web

An Entailment Relation for Reasoning on the Web

A Visual Language for Web Querying and Reasoning

The XML Query Language Xcerpt: Design Principles, Examples, and Semantics

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