Topic
Semantic Web
About: Semantic Web is a research topic. Over the lifetime, 26987 publications have been published within this topic receiving 534275 citations. The topic is also known as: Sem Web & SemWeb.
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01 Nov 2003
TL;DR: This paper proposes an ontology-based framework for the automatic composition of Web services with formal safeguards for meaningful composition through the use of composability rules, and provides an implementation using an E-government application offering customized services to indigent citizens.
Abstract: Service composition is gaining momentum as the potential silver bullet for the envisioned Semantic Web. It purports to take the Web to unexplored efficiencies and provide a flexible approach for promoting all types of activities in tomorrow’s Web. Applications expected to heavily take advantage of Web service composition include B2B E-commerce and E-government. To date, enabling composite services has largely been an ad hoc, time-consuming, and error-prone process involving repetitive low-level programming. In this paper, we propose an ontology-based framework for the automatic composition of Web services. We present a technique to generate composite services from high-level declarative descriptions. We define formal safeguards for meaningful composition through the use of composability rules. These rules compare the syntactic and semantic features of Web services to determine whether two services are composable. We provide an implementation using an E-government application offering customized services to indigent citizens. Finally, we present an exhaustive performance experiment to assess the scalability of our approach.
689 citations
01 Aug 2008
TL;DR: This paper proposes an RDF storage scheme that uses the triple nature of RDF as an asset, which confers significant advantages compared to previous approaches for RDF data management, at the price of a worst-case five-fold increase in index space.
Abstract: Despite the intense interest towards realizing the Semantic Web vision, most existing RDF data management schemes are constrained in terms of efficiency and scalability Still, the growing popularity of the RDF format arguably calls for an effort to offset these drawbacks Viewed from a relational-database perspective, these constraints are derived from the very nature of the RDF data model, which is based on a triple format Recent research has attempted to address these constraints using a vertical-partitioning approach, in which separate two-column tables are constructed for each property However, as we show, this approach suffers from similar scalability drawbacks on queries that are not bound by RDF property value In this paper, we propose an RDF storage scheme that uses the triple nature of RDF as an asset This scheme enhances the vertical partitioning idea and takes it to its logical conclusion RDF data is indexed in six possible ways, one for each possible ordering of the three RDF elements Each instance of an RDF element is associated with two vectors; each such vector gathers elements of one of the other types, along with lists of the third-type resources attached to each vector element Hence, a sextuple-indexing scheme emerges This format allows for quick and scalable general-purpose query processing; it confers significant advantages (up to five orders of magnitude) compared to previous approaches for RDF data management, at the price of a worst-case five-fold increase in index space We experimentally document the advantages of our approach on real-world and synthetic data sets with practical queries
684 citations
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TL;DR: This paper presents a revision of the new methodologies that are designed to allow for efficient data mining and information fusion from social media and of thenew applications and frameworks that are currently appearing under the “umbrella” of the social networks, socialMedia and big data paradigms.
681 citations
01 Jan 2009
TL;DR: A novel variant of RDF(S), called RDFS-FA, is introduced, which provides a solid semantic foundation for many of the latest Description Logic-based SW ontology languages, such as OWL-DL and OWL2-DL.
Abstract: This chapter introduces Resource Description Framework (RDF), the W3C recommendation for semantic annotations in the Semantic Web It will cover the syntax and semantics of RDF, as well as its relation with the W3C OWL Web Ontology Language To address the mismatch between RDF and OWL-DL, the most expressive decidable fragment of the OWL standard, we introduce a novel variant of RDF(S), called RDFS-FA, which provides a solid semantic foundation for many of the latest Description Logic-based SW ontology languages, such as OWL-DL and OWL2-DL
680 citations
TL;DR: A vision for Semantic Web Services, which combine the growing Web services architecture and theSemantic Web, is introduced and DAML-S is proposed as a prototypical example of an ontology for describing SemanticWeb services.
671 citations