Sam Coppens

Sam Coppens
IBM · SCTC, Dublin, Ireland

About

48
Publications
5,937
Reads
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390
Citations
Additional affiliations
December 2008 - January 2014
Ghent University
Position
  • Researcher

Publications

Publications (48)
Article
In this article, we present PREMIS OWL. This is a semantic formalisation of the PREMIS 2.2 data dictionary of the Library of Congress. PREMIS 2.2 are metadata implementation guidelines for digitally archiving information for the long term. Nowadays, the need for digital preservation is growing. A lot of the digital information produced merely a dec...
Book
Provenance is information about entities, activities, and people involved in producing a piece of data or thing, which can be used to form assessments about its quality, reliability or trustworthiness. This document describes extensions to PROV to facilitate the modeling of provenance for dictionary data structures. PROV-DM specifies a Collection a...
Conference Paper
To unlock the full potential of Linked Data sources, we need flexible ways to query them. Public SPARQL endpoints aim to fulfill that need, but their availability is notoriously problematic. We therefore introduce Linked Data Fragments, a publishing method that allows efficient offloading of query execution from servers to clients through a lightwe...
Conference Paper
In this paper, we provide a novel semantic workflow system, based on semantic functional service descriptions and a rule file that can be scheduled on a grid. The workflow engine follows a three-step process. First, it determines for all the resources in its knowledge base the functionality they need to progress in the workflow. This uses a phase-f...
Conference Paper
Linked Data resources change rapidly over time, making a valid consistent state difficult. As a solution, the Memento framework offers content negotiation in the datetime dimension. However, due to a lack of formally described versioning, every server needs a costly custom implementation. In this poster paper, we exploit published provenance of Lin...
Conference Paper
In this paper, we provide a novel semantic workflow system, based on semantic functional service descriptions and a rule file. The workflow engine follows a three-step process. First, it determines for all the resources in its knowledge base the functionality they need to progress in the workflow. This uses a phase-functionality rule file which bin...
Conference Paper
Data provenance is defined as information about entities, activities and people producing or modifying a piece of data. On the Web, the interchange of standardized provenance of (linked) data is an essential step towards establishing trust. One mechanism to track (part of) the provenance of data, is through the use of version control systems (VCS),...
Conference Paper
Querying the Linked Open Data cloud as a whole still remains problematic. Prior knowledge is required to federate the queries to the appropriate datasets: each dataset provides its own SPARQL endpoint to query that dataset, and each dataset uses its own vocabulary to describe their information. In this paper, we propose a federated and asynchronous...
Conference Paper
This paper describes the mechanisms involved in accessing provenance on the Web, according to the new W3C PROV specifications, and how end-users can process this information to make basic trust assessments. Additionally, we illustrate this principle by implementing a practical use case, namely Tim Berners-Lee’s vision of the "Oh, yeah?" button, ena...
Conference Paper
This paper describes how to model uncertain provenance and provenance of uncertain things in a flexible and unintrusive manner using PROV, W3C's new standard for provenance. Three new attributes with clearly defined values and semantics are proposed. Modeling this information is an important step towards the modeling and derivation of trust from re...
Conference Paper
Until now, the SPARQL query language was restricted to simple entailment. Now SPARQL is being extended with more expressive entailment regimes. This allows to query over inferred, implicit knowledge. However, in this case the SPARQL endpoint provider decides which inference rules are used for its entailment regimes. In this paper, we propose an ext...
Article
Today, people have only limited, valuable leisure time at their hands which they want to fill in as good as possible according to their own interests, whereas broadcasters want to produce and distribute news items as fast and targeted as possible. These (developing) news stories can be characterised as dynamic, chained, and distributed events in ad...
Article
Read/Write infrastructures are often predicted to be the next big challenge for Linked Data. In the domains of Open Data and cultural heritage, this is already an urgent need. They require the exchange of partial graphs, personalised views on data and a need for trust. A strong versioning model supported by provenance is therefore crucial. However,...
Article
We will show that semantically annotated paths lead to discovering meaningful, non-trivial relations and connections between multiple resources in large online datasets such as the Web of Data. Graph algorithms have always been key in path finding applications (e.g., navigation systems). They make optimal use of available computation resources to f...
Conference Paper
Full-text available
If we want automated agents to consume the Web, they need to understand what a certain service does and how it relates to other services and data. The shortcoming of existing service description paradigms is their focus on technical aspects instead of the functional aspect—what task does a service perform, and is this a match for my needs? This pap...
Article
Metadata has been around and has evolved for centuries, albeit not recognized as such. Medieval manuscripts typically had illuminations at the start of each chapter, being both a kind of signature for the author writing the script and a pictorial chapter anchor for the illiterates at the time. Nowadays, there is so much fragmented information on th...
Conference Paper
Nowadays news is omnipresent and citizens rely on consuming "breaking" news events whenever they want, wherever they are, on whatever device in their immediate surroundings. But these users get overwhelmed by too many individual and disconnected pieces of information, and cannot situate the news in a proper context. Consequently, current open news...
Conference Paper
Full-text available
As interest in provenance grows among the Semantic Web community, it is recognized as a useful tool across many domains. However, existing automatic provenance collection techniques are not universally applicable. Most existing methods either rely on (low-level) observed provenance, or require that the user discloses formal workflows. In this paper...
Article
Full-text available
Nowadays, most people have limited leisure time and the offer of (cultural) activities to spend this time is enormous. Consequently, picking the most appropriate events becomes increasingly difficult for end-users. This complexity of choice reinforces the necessity of filtering systems that assist users in finding and selecting relevant events. Whe...
Conference Paper
Full-text available
The early visions for the Semantic Web, from the famous 2001 Scientific American article by Berners-Lee et al., feature intelligent agents that can autonomously perform tasks like discovering information, scheduling events, finding execution plans for complex operations, and in general, use reasoning techniques to come up with sense-making and trac...
Article
Today, people have a lot of spare time at their hands which they want to fill in according to their interests, whereas cultural temples are trying to attract interested communities to their carefully planned cultural programs. These cultural activities can be characterised as dynamic and distributed events in addition to which it is important to ag...
Conference Paper
This paper introduces a Linked Data application for automatically generating a story between two concepts in the Web of Data, based on formally described links. A path between two concepts is obtained by querying multiple linked open datasets; the path is then enriched with multimedia presentation material for each node in order to obtain a full mu...
Conference Paper
Today, people have limited leisure time which they want to fill in according to their interests. At the same time, cultural organisations offer an enormous amount of activities via their websites. This scarcity of time and the abundance of cultural events reinforce the necessity of recommender systems that assist end-users in discovering events whi...
Conference Paper
Full-text available
In Belgium, we developed a digital long-term preservation archive to preserve the information from our heritage institutions. This platform harvests the information from the institutions, preserves the information for the long term and disseminates the information as Linked Open Data. Our platform produces many different versions of the harvested d...
Article
Full-text available
Today, people have only limited, valuable leisure time at their hands which they want to fill in as good as possible according to their own interests, whereas broadcasters want to produce and distribute news items as fast and targeted as possible. These (developing) news stories can be charac-terised as dynamic, chained, and distributed events in a...
Book
Full-text available
In het derde werkpakket van het project BOM-Vl (Bewaring en Ontsluiting van Multimediale data in Vlaanderen, 2008-2009) staat de technische problematiek van langetermijnbewaring van digitaal erfgoed centraal. Het OAIS-model, een ISO-standaard sinds 2002, geldt hierbij als conceptueel referentiemodel dat richtlijnen biedt bij de opzet van een digita...
Article
Full-text available
In Flanders, Belgium, many heritage institutions disseminate their metadata using the Open Archives Initiative Protocol for Metadata Harvesting. However this protocol does not offer granular access to the metadata. This can be solved by exposing the metadata as Linked Data. For this, we developed a semantic metadata schema consisting of two layers:...

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