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More information is available at http://www.streamreasoning.org/events/ordring2014
More information is available at http://jcris2014.icmc.usp.br/index.php/kdmile
The goal of the Stream Reasoning for Linked Data tutorial is twofold: to (1) introduce scalable reasoning and querying techniques to SW researchers as powerful tool to make use of linked data and large-scale ontologies, and to (2) present interesting research problems for SW that arise in reasoning with highly dynamic data streams [DCvF09,RPZ10a]. The tutorial consists of five parts. It will begin with an introduction of linked data streams, as well as reasoning using the Semantic Web standard ontology language OWL 2. The second part will introduce semantic processing of data streams explained using C-SPARQL, a continuous extension of SPARQL for querying RDF streams and RDF graphs. The third part will provide an overview of ontology-based access to data streams through query rewriting to Stream Processing Engines and using stream-to-ontology mappings. The fourth part of the tutorial is a hands-on session on tools and systems related to the previous parts. The fith part of the tutorial will present other stream reasoning techniques for RDFS and OWL2-RL. The last part will wrap up the tutorial and present an overview of the open challenges.
More information is available at http://streamreasoning.org/events/sr4ld2014
More information at http://www.semantics.cc/www.semantics.cc/programme/accepted-papers/index.html
Abstract: The creation of schema.org as the de facto vocabulary for the implementation of Semantic Annotations was the dawn of a new era for the Web by motivating the Web developers to start weaving semantics in the content, mainly, for visibility reasons in search engine results. Moving further, the new version of the vocabulary enables Web entities to self-describe the Actions with which they interact with users, agents or services. In this scope, we present our ongoing work on automatic weaving of Actions based on the existing semantic annotations of a website.
More information at: http://www.semantics.cc/www.semantics.cc/programme/accepted-papers/index.html
Abstract: As the amount of available linked data expand and the number of related applications increases, the management of aspects such as provenance and access control of such data begin to become an issue. Current approaches do not provide sufficient support for automatic reasoning over different metadata types and their possible interdependencies. MetaReasons is a framework that supports representation and automated reasoning over metadata in a single logical formalism. Different types of metadata, like data-provenance and accessibility-restrictions, are represented as distinct meta-theories and dependencies between metadata types are represented by rules between different meta-theories. In this paper we present the definition of the MetaReasons framework and two examples meta-theories for provenance and access control. Moreover, we propose a materialization calculus for forward reasoning on the two aspects.
Abstract: The surge in availability of geospatial data sources, the increased use of crowdsourced maps and the advent of geospatial mashups have brought us to an era where geospatial information is delivered to users after integration from diverse sources. Understanding the provenance of geospatial data is crucial for assessing the quality of the data and addressing whether to trust the information or not. In this paper we describe user requirements for modeling geospatial provenance.
Short paper: downloadUser requirments for geospatial provenance from dgarijo
Abstract: The development of theWeb in the direction of user-generated content, information sharing, online collaboration and social media, have drastically increased the number of communication channels that can be used to interact with potential customers. In this demonstration we present the latest developments of our multi-channel communication so-
lution, which enables touristic service providers, e.g. hoteliers and touristic associations, in dealing with the challenge of improving and maintaining their communication needs. We make use of semantic technologies, i.e. semantic analysis, semantic annotations, ontologies, semantic matching and rules in order to automate several multi-channel communication tasks.
Short paper: download
Abstract: Given the increasing amount of sensitive RDF data available on theWeb, it becomes critical to guarantee secure access to this content. The problem becomes even more challenging in the presence of RDFS inference, where inferred knowledge needs to be protected in the same way as explicit one. State of the art models for RDF access control annotate triples with concrete values that denote whether a triple can be accessed or not. In such approaches, the computation of the corresponding values for the inferred triples is hard-coded; this creates several problems in the presence of updates in the data, or, most importantly, when the access control policies change. We answer the above challenges by proposing an abstract model where the access labels are abstract tokens, and the computation of inferred labels is modelled through abstract operators. We demonstrate our model through the HACEA (Health Access Control Enforcement Application) that provides simple access control/privacy functionalities in the context of a medical use case.pe:
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The tutorial provides a comprehensive view of the RDF-Stream Processing (RSP) research area. It consists of four parts. The first one introduces the RSP basic concepts: RDF streams to represent temporally-ordered sequence of data items; continuous SPARQL extensions to query RDF streams, and RSP engines to execute continuous query answering over RDF streams. The second part presents the available RSP engine implementations. It starts with an overview on the existing RSP engines, highlighting similarities and differences among them. Next, two existing implementations are analysed in depth: C-SPARQL and SPARQLstream. The third part is a hands-on session where the attendees learn how to (1) use the three presented RSP engines presented above and (2) let the systems interact among them. Finally, the fourth part of the tutorial provides an overview on RSP-related topics: RSP engine benchmarking, stream reasoning and real-world deployments. The tutorial closes with a discussion on the open challenges and the research problems of this research field.
More information at http://streamreasoning.org/Past-Events/rsp2014
Abstract: The vast majority of people use the Internet to search for various products and services including those touristic. Now more than ever it becomes critical for touristic businesses to have a strong online presence. In order to achieve this goal it is however essential that multiple communication channels and technologies are properly used. In particular having semantic annotations on the website that can be understood by search engines is extremely important. In this paper we present our ongoing eort on using Linked Data technologies to improve the online visibility of touristic service providers from Innsbruck and its surroundings. We show which technologies are relevant, how they can be applied in our real world pilot and we measure the impact of using such technologies.
Paper: Download here
More information (in Greek): http://www.avgi.gr/article/2287277/ekdilosi-gia-tis-nees-texnologies-me-r-dourou-kai-g-sakellaridi
Abstract: We report on our experiences with integrating geospatial datasets using Linked Data technologies. We describe NeoGeo, an integration vocabulary, and an integration scenario involving two geospatial datasets: the GADM database of Global Administrative Areas and NUTS, the Nomenclature of Territorial Units for Statistics. We identify the need for provenance to be able to correctly interpret query results over the integrated dataset.
Short paper: Download here