BibSonomy publications for /user/diego_ma/semantic_webTue Sep 02 04:08:07 CEST 2008Proc. First International Workshop on Semantic Web and DatabasesEfficient {RDF} Storage and Retrieval in {Jena2}2003semantic_web RDF inf_retrieval RDF and related Semantic Web technologies have been the recent focus of much research activity. This work has led to new specifications for RDF and OWL. However, efficient implementations of these standards are needed to realize the vision of a world-wide semantic Web. In particular, implementations that scale to large, enterprise-class data sets are required. Jena2 is the second generation of Jena, a leading semantic web programmers' toolkit. This paper describes the persistence subsystem of Jena2 which is intended to support large datasets. This paper describes its features, the changes from Jena1, relevant details of the implementation and performance tuning issues. Query optimization for RDF is identified as a promising area for future research.Tue Sep 02 03:52:42 CEST 2008On-line{RDF} Storage and Retrieval Systems2008semantic_web inf_retrieval RDF web Ontologies are often used to improve data access. For this purpose, existing data has to be linked to an ontology and appropriate access mechanisms have to be provided. In this chapter, we review RDF storage and retrieval technologies as a common approach for accessing ontology-based data. We discuss different storage models, typical functionalities of RDF middleware such as data model support and reasoning capabilities and RDF query languages with a special focus on SPARQL as an emerging standard. We also discuss some trends such as support for expressive ontology and rule languages.Mon Apr 21 06:15:19 CEST 2008OnlineWhat the Semantic Web Can Represent1998semantic_web There are many other data models which RDF's Directed Labelled Graph (DLG) model compares closely with, and maps onto. This page is written with the intention of enumerating the similarity and diferences between the models, to indicate how the mapping might be done and what extra information muast be added in the process. Where the other models are related to previous unmet promises of computer science, now passed into folk law as unsolvable problems, they suggest a fear that the goal of a Semantic Web is inappropriate.Mon Apr 21 06:12:54 CEST 2008On-lineReflections on Web Architecture2001semantic_web Mon Apr 21 06:12:01 CEST 2008Scientific AmericanMayThe Semantic Web2001XML semantic_web A new form of Web content that is meaningful to computers will unleash a revolution of new possibilitiesMon Apr 21 06:11:29 CEST 2008On-line draft \myurl{http://www.w3.org/DesignIssues/Toolbox.html}The Semantic Toolbox: Building Semantics on top of {XML-RDF}1999XML semantic_web Mon Apr 21 06:11:00 CEST 2008On-line draft \myurl{www.w3.org/DesignIssues/Semantic.html}Semantic Web Roadmap1998XML semantic_web An attempt to give a high-level plan of the architecture of the Semantic WWW. A road map for the future, an architectural plan untested by anything except thought experimentsFri Dec 14 02:46:55 CET 2007Lisbon, PortugalProc. ECDL 2000 Workshop on the Semantic WebAn Extensible Approach for Modelling Ontologies in {RDF(S)}2000semantic_web ontology RDF(S) constitutes a newly emerging standard for metadata that is about to turn the World Wide Web into a machine-understandable knowledge base. It is an XML application that allows for the denotation of facts and schemata in a web-compatible format, building on an elaborate object-model for describing concepts and relations. Thus, it might turn up as a natural choice for a widely-useable ontology description language. However, its lack of capabilities for describing the semantics of concepts and relations beyond those provided by inheritance mechanisms makes it a rather weak language for even the most austere knowledge-based system. This paper presents an approach for modeling ontologies in RDF(S) that also considers axioms as objects that are describable in RDF(S). Thus, we provide flexible, extensible, and adequate means for accessing and exchanging axioms in RDF(S). Our approach follows the spirit of the World Wide Web, as we do not assume a global axiom specification language that is too intractable for one purpose and too weak for the next, but rather a methodology that allows (communities of) users to specify what axioms are interesting in their domain.Fri Dec 14 02:43:12 CET 2007IEEE Intelligent Systems182-85Question Answering on the Semantic Web192004semantic_web question_answering Question answering on the Web is moving beyond the stage where users simply type a query and retrieve a ranked ordering of appropriate Web pages. Users and analysts want targeted answers to their questions without extraneous information. These answers miht contain information from current and authoritative sources, terms with the same meaning as those used in the query, relevant links such as justifications, follow-up questions fitting the context, and provenance information (author, input date, authoritativeness, source, ranking, and so on). Next-generation question-answering systems might also provide better querying support...Fri Dec 14 02:41:25 CET 2007Proc. ODBASE 2002Natural Language Annotations for the Semantic Web2002question_answering semantic_web annotation Because the ultimate purpose of the Semantic Web is to help users locate, organize, and process information, we strongly believe that it should be grounded in the information access method humans are most comfortable with ---natural language. However, the Resource Description Framework (RDF), the foundation of the Semantic Web, was designed to be easily processed by computers, not humans. To render RDF friendlier to humans, we propose to augment it with natural language annotations, or metadata written in everyday language. We argue that natural language annotations are not only intuitive and e.ective, but can also accelerate the pace with which the Semantic Web is being adopted. We demonstrate the use of natural language annotations from within Haystack, an end user Semantic Web platform that also serves as a testbed for our ideas. In addition to a prototype SemanticWeb question answering system, we describe other opportunities for marrying natural language and Semantic Web technology.Fri Dec 14 02:38:14 CET 2007Data and Knowledge EngineeringThe Semantic Web: Yet Another Hip?forthcomingsemantic_web Currently computers are changing from single isolated devices into entry points to a worldwide network of information exchange and business transactions called the World Wide Web (WWW)...Fri Dec 14 02:36:19 CET 2007On-line \myurl{http://www.dfki.uni-kl.de/\~{}boley/sw10pass-en.htm}10The Semantic Web in Ten Passages2002semantic_web The substance of the Semantic Web and the technology of semantic search engines are discussed. The article explains the notions of semantic search, crawlers, precision and recall, standard concepts, as well as standard predicates and knowledge derivation. It discusses the issues of agreeing on standard concepts/predicates, how to assign them to Web pages, and where to store these assignments as metadata. It further shows how refined concepts inherit standard predicates and why maintenance is a hard problem in library catalogues and metadata ontologies.Fri Dec 14 02:35:12 CET 2007Semantic Web Meets Language Resources -- Papers from the AAAI WorkshopTechnical Report WS-02-1620-29A Semantic Web Page Linguistic Annotation Model2003semantic_web annotation Although with the {\em Semantic Web} initiative much research on web page semantic annotation has already been done by AI researchers, linguistic text annotation, including the semantic one, was originally developed in Corpus Linguistics and its results have been somehow neglected by AI. The purpose of the research presented in this proposal is to prove that integration of results in both fields is not only possible, but also highly useful in order to make Semantic Web pages more machine-readable...