A query language for XML

Deutsch, Alin; Fernández, Mary; Florescu, Daniela; Levy, Alon Y.; Suciu, Dan

doi:10.1016/s1389-1286(99)00020-1

Cited by 390 publications

(244 citation statements)

References 5 publications

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“…XPath path expressions (disregarding XPath predicates for the moment) fall into this category with closure axes such as descendant. This type of path expressions is very common in XML query languages (e.g., XML-QL [41], Quilt [30], XPath and all XML query languages based on XPath). It is also used in the RDF query language iTQL [2].…”

Section: Triple Patterns Vs Path Expressionsmentioning

confidence: 99%

RDF Querying: Language Constructs and Evaluation Methods Compared

Furche¹,

Linse²,

Bry³

et al. 2006

Reasoning Web

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Abstract. This article is firstly an introduction into query languages for the Semantic Web, secondly an in-depth comparison of the languages introduced. Only RDF query languages are considered because, as of the writing of this paper, query languages for other Semantic Web data modeling formalisms, especially OWL, are still an open research issue, and only a very small number of, furthermore incomplete, proposals for querying Semantic Web data modeled after other formalisms than RDF exist. The limitation to a few RDF query languages is motivated both by the objective of an in-depth comparison of the languages addressed and by space limitations. During the three years before the writing of this article, more than three dozen proposals for RDF query languages have been published! Not only such a large number, but also the often immature nature of the proposals makes the focus on few, but representative languages a necessary condition for a non-trivial comparison.For this article, the following RDF query languages have been, admittedly subjectively, selected: Firstly, the "relational" or "pattern-based" query languages SPARQL, RQL, TRIPLE, and Xcerpt; secondly the reactive rule query language Algae; thirdly and last the "navigational access" query language Versa. Although subjective, this choice is arguably a good coverage of the diverse language paradigms considered for querying RDF data. It is the authors' hope and expectation, that this comparison will motivate and trigger further similar studies, thus completing the present article and overcoming its limitation.

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Section: Triple Patterns Vs Path Expressionsmentioning

confidence: 99%

RDF Querying: Language Constructs and Evaluation Methods Compared

Furche¹,

Linse²,

Bry³

et al. 2006

Reasoning 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%

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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“…The target of the proposed XML query languages, such as XQuery [9] and XML-QL [1], is to query XML documents and they are not designed for the information stored in XML databases. We introduce a set of operations for the NRSM, called the NRS operations, which is a combination of the refinements of existing relation algebra [7,2] together with some newly defined operations such as the rearrange and swap operations.…”

Section: Formulating Queries In the Nrsd Systemmentioning

confidence: 99%

Storing and Querying XML Data in the Nested Relational Sequence Database System

Lau

2003

Lecture Notes in Computer Science

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Abstract. We developed the Nested Relational Sequence Database System (NRSD System), which is built upon the Nested Relational Sequence Model (NRSM). The NRSM eliminates a substantial amount of redundancy embedded in XML documents and preserves the order of XML data. In this paper, we demonstrate that the storing and querying of XML data are desirable over an NRS relation, which we incorporate an index system into the NRSD System. We introduce a set of NRS operations which allow users to manipulate the XML data effectively and demonstrate how to use NRS operations to query the XML data stored in the NRSD System. Our experimental results confirm that the NRSD System substantially reduces the storage size of data. We also study the performance of the select and project operations having path expressions at different nested levels.

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A query language for XML

Cited by 390 publications

References 5 publications

RDF Querying: Language Constructs and Evaluation Methods Compared

RDF Querying: Language Constructs and Evaluation Methods Compared

A Visual Language for Web Querying and Reasoning

Storing and Querying XML Data in the Nested Relational Sequence Database System

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