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

Bry, François; Schaffert, Sebastian

doi:10.1007/3-540-36560-5_22

Cited by 33 publications

(20 citation statements)

References 4 publications

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“…Xcerpt [13,24,88,89], cf. http://xcerpt.org, is a language for querying both data on the "standard Web" (e.g., XML and HTML data) and data on the Semantic Web (e.g., RDF, Topic Maps data).…”

Section: Forall St S[type-$>$t] $O] and P[rdfs:domain-$>$t]) Forallmentioning

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: Forall St S[type-$>$t] $O] and P[rdfs:domain-$>$t]) Forallmentioning

confidence: 99%

RDF Querying: Language Constructs and Evaluation Methods Compared

Furche¹,

Linse²,

Bry³

et al. 2006

Reasoning Web

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show abstract

“…Constraints revealed to be the natural solution to our problem. Languages with flexible arity symbols have been used in various areas: Xcerpt ( [3]) is a query and transformation language for XML which also used terms with flexible arity function symbols as an abstraction of XML documents. It used a special notion of term (called query terms) as patterns specifying selection of XML terms much like Prolog goal atoms.…”

Section: Related Workmentioning

confidence: 99%

CLP(Flex): Constraint Logic Programming Applied to XML Processing

Coelho

Florido

2004

On the Move to Meaningful Internet Systems 2004: CoopIS, DOA, and ODBASE

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In this paper we present an implementation of a constraint solving module, CLP(Flex), for dealing with unification in an equality theory for terms with flexible arity function symbols. Then we present an application of CLP(Flex) to XML-processing where XML documents are abstracted by terms with flexible arity symbols. This gives a highly declarative model for XML processing yielding a substantial degree of flexibility in programming.

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“…However, UnQL rules may not be connected by chaining and lack many of the constructs found in Xcerpt. Several publications concerning the language design and semantics of Xcerpt are available, in particular [5,15,12,16]. Visual XML query languages that the authors are aware of are XML-GL [6], GraphLog [7], VXT [8], BBQ [9] and Xing [10].…”

Section: Related and Future Workmentioning

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

Cited by 33 publications

References 4 publications

RDF Querying: Language Constructs and Evaluation Methods Compared

RDF Querying: Language Constructs and Evaluation Methods Compared

CLP(Flex): Constraint Logic Programming Applied to XML Processing

A Visual Language for Web Querying and Reasoning

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