1,070 research outputs found
Survey over Existing Query and Transformation Languages
A widely acknowledged obstacle for realizing the vision of the Semantic Web is the inability
of many current Semantic Web approaches to cope with data available in such diverging
representation formalisms as XML, RDF, or Topic Maps. A common query language is the first
step to allow transparent access to data in any of these formats. To further the understanding
of the requirements and approaches proposed for query languages in the conventional as well
as the Semantic Web, this report surveys a large number of query languages for accessing
XML, RDF, or Topic Maps. This is the first systematic survey to consider query languages from
all these areas. From the detailed survey of these query languages, a common classification
scheme is derived that is useful for understanding and differentiating languages within and
among all three areas
Solving the TTC 2011 Compiler Optimization Case with QVTR-XSLT
In this short paper we present our solution for the Compiler Optimization
case study of the Transformation Tool Contest (TTC) 2011 using the QVTR-XSLT
tool. The tool supports editing and execution of the graphical notation of QVT
Relations languageComment: In Proceedings TTC 2011, arXiv:1111.440
Web and Semantic Web Query Languages
A number of techniques have been developed to facilitate
powerful data retrieval on the Web and Semantic Web. Three categories
of Web query languages can be distinguished, according to the format
of the data they can retrieve: XML, RDF and Topic Maps. This article
introduces the spectrum of languages falling into these categories
and summarises their salient aspects. The languages are introduced using
common sample data and query types. Key aspects of the query
languages considered are stressed in a conclusion
A Quality-Aware Approach to Web Services Procurement
Web services bring programmers a new way to develop advanced applications
able to integrate any group of services on the Internet into a single
solution. Web services procurement (WSP) is focussed on the acquisition of web
services, including some complex tasks such as the specification of demands, the
search for available offers, and the best choice selection. Although the technology
to support them already exists, there are only a few approaches wherein qualityof-
service in demands and offers is taken into account, in addition to functionality.
In this paper, we present some implementation issues on a quality-aware
approach to WSP, whose solution is mainly based on using mathematical constraints
to define quality-of-service in demands and offers.Ministerio de Ciencia y Tecnología TIC2000-1106-C02-01Ministerio de Ciencia y Tecnología FIT-150100-2001-78Junta de Comunidades de Castilla La Mancha PCB-02-00
Automating the Procurement of Web Services
As government agencies and business become more dependent on
web services, software solutions to automate their procurement gain importance.
Current approaches for automating the procurement of web services suffer from
an important drawback: neither uncertainty measures nor non-linear, and complex
relations among parameters can be used by providers to specify quality-ofservice
in offers. In this paper, we look deeply into the roots of this drawback
and present a proposal which overcomes it. The key point to achieve this improvement
has been using the constraint programming as a formal basis, since
it endows the model with a very powerful expressiveness. A XML-based implementation
is presented along with some experimental results and comparisons
with other approaches.Comisión Interministerial de Ciencia y Tecnología TIC 2000–1106–C02–01Ministerio de Ciencia y Tecnología TIC2003-02737-C02-01Ministerio de Ciencia y Tecnología FIT-150100-2001-7
Reasoning & Querying – State of the Art
Various query languages for Web and Semantic Web data, both for practical use and as an area of research in the scientific community, have emerged in recent years. At the same time, the broad adoption of the internet where keyword search is used in many applications, e.g. search engines, has familiarized casual users with using keyword queries to retrieve information on the internet. Unlike this easy-to-use querying, traditional query languages require knowledge of the language itself as well as of the data to be queried. Keyword-based query languages for XML and RDF bridge the gap between the two, aiming at enabling simple querying of semi-structured data, which is relevant e.g. in the context of the emerging Semantic Web. This article presents an overview of the field of keyword querying for XML and RDF
An Entailment Relation for Reasoning on the Web
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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