RDF Querying

Reactive Web systems, Web services, and Web-based publish/ subscribe systems communicate events as XML messages, and in many cases require composite event detection: it is not sufficient to react to single event messages, but events have to be considered in relation to other events that are received over time. Emphasizing language design and formal semantics, we describe the rule-based query language XChangeEQ for detecting composite events. XChangeEQ is designed to completely cover and integrate the four complementary querying dimensions: event data, event composition, temporal relationships, and event accumulation. Semantics are provided as model and fixpoint theories; while this is an established approach for rule languages, it has not been applied for event queries before

The National Transport Data Framework

Report by Professor Peter Landshoff (Cambridge University) and Professor John Polak (Imperial College London) on a project for the Department for Transport. emails: [email protected] [email protected] NTDF is designed to be a resource for data owners to deposit descriptions into a central catalogue, so that people can search for data and find data and understand their characteristics. The value of this is to individuals, to commercial organizations, and to public bodies. For example, services that provide better information to travellers will help to make their journey less stressful and persuade them to make more use of public transport. Transport operators need very diverse information to help them plan developments to their services: demographic, geographical, economic etc. And policy makers need a similar range of information to help them decide how to divide their budget and afterwards to evaluate how valuable it has been.This work was supported by the Department for Transport (DfT)

VPOET: Using a Distributed Collaborative Platform for Semantic Web Applications

This paper describes a distributed collaborative wiki-based platform that has been designed to facilitate the development of Semantic Web applications. The applications designed using this platform are able to build semantic data through the cooperation of different developers and to exploit that semantic data. The paper shows a practical case study on the application VPOET, and how an application based on Google Gadgets has been designed to test VPOET and let human users exploit the semantic data created. This practical example can be used to show how different Semantic Web technologies can be integrated into a particular Web application, and how the knowledge can be cooperatively improved.Comment: accepted for the 2nd International Symposium on Intelligent Distributed Computing - IDC'2008. September 18-20, 2008, Catania, Ital

The Darwin Core extension for genebanks opens up new opportunities for sharing genebank datasets

Darwin Core (DwC) defines a standard set of terms to describe the primary biodiversity data. Primary biodiversity data are data records derived from direct observation of species occurrences in nature or describing specimens in biological collections. The Darwin Core terms can be seen as an extension to the standard Dublin Core metadata terms. The new Darwin Core extension for genebanks declares the additional terms required for describing genebank datasets, and is based on established standards from the plant genetic resources community. The Global Biodiversity Information Facility (GBIF) provides an information infrastructure for biodiversity data including a suite of software tools for data publishing, distributed data access, and the capture of biodiversity data. The Darwin Core extension for genebanks is a key component that provides access for the genebanks and the plant genetic resources community to the GBIF informatics infrastructure including the new toolkits for data exchange. This paper provides one of the first examples and guidelines for how to create extensions to the Darwin Core standard

XML and Semantics

Since the early days of introducing eXtensible Markup Language (XML), owing to its expressive capabilities and flexibilities, it became the defacto standard for representing, storing, and interchanging data on the Web. Such features have made XML one of the building blocks of the Semantic Web. From another viewpoint, since XML documents could be considered from content, structural, and semantic aspects, leveraging their semantics is very useful and applicable in different domains. However, XML does not by itself introduce any built-in mechanisms for governing semantics. For this reason, many studies have been conducted on the representation of semantics within/from XML documents. This paper studies and discusses different aspects of the mentioned topic in the form of an overview with an emphasis on the state of semantics in XML and its presentation methods

Prototype de mise en oeuvre du profil OÉAF /Réalisation et exploitation d'un référentiel

Tiré de l'écran-titre (visionné le 27 juin 2017).La réalisation d’un prototype de référentiel d’opportunités d’étude, d’apprentissage et de formation basé sur son profil d’application OÉAF et rendre ce répertoire de métadonnées disponible à la communauté éducative pour expérimenter la publication de leurs offres d’étude, d’apprentissage et de formation. Ce document présente les résultats des travaux réalisés au cours du projet 2.9 du GTN-Québec : « Prototype de mise en œuvre du profil OÉAF / Réalisation et exploitation d’un référentiel ». Le projet a consisté à mettre en place une application logicielle web s’appuyant sur l’approche RDF (Resource Description Framework), ainsi que d’autres outils, pour permettre à des fournisseurs du milieu de l’éducation, de publier des offres d’étude, d’apprentissage et de formations, et aussi pour permettre la consultation de l’offre

L'ontologie NiceTag : les tags en tant que graphes nommés

International audienceCurrent tag modelling does not fully take into account the rich and diverse nature tags, as signs, can take on. We propose an ontology of tags in which tags are modelled as named graphs. These named graphs are made of a resource linked to a “sign” which can be any resource reachable on the Web (an ontology concept, an image, etc.). The purpose of our model is to be able to describe tags in a very general manner, and as an immediate conse- quence, to describe tags as modelled by other tag models (SCOT, CommonTag, etc.).Notre analyse part du constat selon lequel les modélisations des tags dont nous disposons actuellement ne prennent pas suffisamment en considération leur richesse et leur diversité. Aussi proposons-nous, pour pallier ce défaut, une ontologie dans laquelle les tags seraient assimilés à des graphes nommés. Ceux-ci sont constitués au minimum d'une ressource reliée à un « signe » qui peut lui-même s'apparenter à n'importe quelle ressource accessible en ligne (un concept d'une ontologie, une image, etc.). Ce modèle entend ainsi fournir une caractérisation suffisamment générale et flexible des tags, et, par voie de conséquence, un cadre susceptible de s'appliquer à tous les tags, quelque soit le modèle sur lequel repose leur description (SCOT, CommonTag, etc.)

Hypermedia and the semantic web: a research agenda

Until recently, the Semantic Web was little more than a name for the next generation Web infrastructure as envisioned by its inventor, Tim Berners-Lee. Now, with the introduction of XML and RDF, and new developments such as RDF Schema and DAML+OIL, the Semantic Web is rapidly taking shape. In this paper, we first give an overview of the state-of-the-art in Semantic Web technology, the key relationships with traditional hypermedia research, and a comprehensive reference list to various sets of literature (Hypertext, Web and Semantic Web). The core of the paper presents a research agenda b

Context Mediation in the Semantic Web: Handling OWL Ontology and Data Disparity through Context Interchange

The COntext INterchange (COIN) strategy is an approach to solving the problem of interoperability of semantically heterogeneous data sources through context mediation. COIN has used its own notation and syntax for representing ontologies. More recently, the OWL Web Ontology Language is becoming established as the W3C recommended ontology language. We propose the use of the COIN strategy to solve context disparity and ontology interoperability problems in the emerging Semantic Web – both at the ontology level and at the data level. In conjunction with this, we propose a version of the COIN ontology model that uses OWL and the emerging rules interchange language, RuleML.Singapore-MIT Alliance (SMA