In het derde werkpakket van het project BOM-Vl (Bewaring en Ontsluiting van Multimediale data in ... more 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 digitaal archief. Aan de hand hiervan werd in een eerste deliverable aangegeven met welke representatiewijzen van de data en soorten metadata men rekening dient te houden om de preservering van digitaal materiaal te garanderen en hoe men mogelijk dataverlies kan tegengaan door grondige technische overwegingen. In een uitvoerig overzicht, een state-of-the-art, komen de gangbare opslagformaten met betrekking tot verschillend audiovisueel materiaal aan bod. Vervolgens worden ook de meest courante standaarden in het bibliotheekwezen, de omroepsector, de culturele sector en de erfgoedsector besproken, in het bijzonder metadatastandaarden (descriptiev...
If we want automated agents to consume the Web, they need to understand what a certain service do... more 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 paper summarizes our recent work on RESTdesc, a semantic service description approach that centers on functionality. It has a solid foundation in logics, which enables advanced service matching and composition, while providing elegant and concise descriptions, responding to the demands of automated clients on the future Web of Agents.
Hypermedia links and controls drive the Web by transforming information into affordances through ... more Hypermedia links and controls drive the Web by transforming information into affordances through which users can choose actions. However, publishers of information cannot predict all actions their users might want to perform and therefore, hypermedia can only serve as the engine of application state to the extent the user's intentions align with those envisioned by the publisher. In this paper, we introduce distributed affordance, a concept and architecture that extends application state to the entire Web. It combines information inside the representation with knowledge of action providers to generate affordance from the user's perspective. Unlike similar approaches such as Web Intents, distributed affordance scales both in the number of actions and the number of action providers, because it is resource-oriented instead of action-oriented. A proof-of-concept shows that distributed affordance is a feasible strategy on today's Web.
It is difficult for publishers to include the right links in documents, because they cannot predi... more It is difficult for publishers to include the right links in documents, because they cannot predict all actions their users might want to perform. Existing adaptive navigation systems can generate relevant links, but doing this on a Web scale is non-trivial, especially if the targets are dynamic actions. As a result, adaptation often happens in a centralized way on a limited or closed document and action set. Distributed affordance is a technology to automatically generate links from any Web resource to matching actions from an open set of Web services, based on semantic annotations. In this paper, we indicate how this technology can be applied to adaptive navigation. We investigate how the generated links can be represented and how their relevance can be guaranteed. Based on that, we conclude that semantic technologies are an enabler to perform adaptive navigation to dynamic actions in a distributed way.
This paper describes how to model uncertain provenance and provenance of uncertain things in a fl... more 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 resources whose provenance is described using PROV.
The goal of the W3C’s Media Annotation Working Group (MAWG) is to promote interoperability betwee... more The goal of the W3C’s Media Annotation Working Group (MAWG) is to promote interoperability between multimedia metadata formats on the Web. As experienced by everybody, audiovisual data is omnipresent on today’s Web. However, different interaction interfaces and especially diverse metadata formats prevent unified search, access, and navigation. MAWG has addressed this issue by developing an interlingua ontology and an associated API. This article discusses the rationale and core concepts of the ontology and API for media resources. The specifications developed by MAWG enable interoperable contextualized and semantic annotation and search, independent of the source metadata format, and connecting multimedia data to the Linked Data cloud. Some demonstrators of such applications are also presented in this article.
In het derde werkpakket van het project BOM-Vl (Bewaring en Ontsluiting van Multimediale data in ... more 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 digitaal archief. Aan de hand hiervan werd in een eerste deliverable aangegeven met welke representatiewijzen van de data en soorten metadata men rekening dient te houden om de preservering van digitaal materiaal te garanderen en hoe men mogelijk dataverlies kan tegengaan door grondige technische overwegingen. In een uitvoerig overzicht, een state-of-the-art, komen de gangbare opslagformaten met betrekking tot verschillend audiovisueel materiaal aan bod. Vervolgens worden ook de meest courante standaarden in het bibliotheekwezen, de omroepsector, de culturele sector en de erfgoedsector besproken, in het bijzonder metadatastandaarden (descriptiev...
If we want automated agents to consume the Web, they need to understand what a certain service do... more 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 paper summarizes our recent work on RESTdesc, a semantic service description approach that centers on functionality. It has a solid foundation in logics, which enables advanced service matching and composition, while providing elegant and concise descriptions, responding to the demands of automated clients on the future Web of Agents.
Hypermedia links and controls drive the Web by transforming information into affordances through ... more Hypermedia links and controls drive the Web by transforming information into affordances through which users can choose actions. However, publishers of information cannot predict all actions their users might want to perform and therefore, hypermedia can only serve as the engine of application state to the extent the user's intentions align with those envisioned by the publisher. In this paper, we introduce distributed affordance, a concept and architecture that extends application state to the entire Web. It combines information inside the representation with knowledge of action providers to generate affordance from the user's perspective. Unlike similar approaches such as Web Intents, distributed affordance scales both in the number of actions and the number of action providers, because it is resource-oriented instead of action-oriented. A proof-of-concept shows that distributed affordance is a feasible strategy on today's Web.
It is difficult for publishers to include the right links in documents, because they cannot predi... more It is difficult for publishers to include the right links in documents, because they cannot predict all actions their users might want to perform. Existing adaptive navigation systems can generate relevant links, but doing this on a Web scale is non-trivial, especially if the targets are dynamic actions. As a result, adaptation often happens in a centralized way on a limited or closed document and action set. Distributed affordance is a technology to automatically generate links from any Web resource to matching actions from an open set of Web services, based on semantic annotations. In this paper, we indicate how this technology can be applied to adaptive navigation. We investigate how the generated links can be represented and how their relevance can be guaranteed. Based on that, we conclude that semantic technologies are an enabler to perform adaptive navigation to dynamic actions in a distributed way.
This paper describes how to model uncertain provenance and provenance of uncertain things in a fl... more 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 resources whose provenance is described using PROV.
The goal of the W3C’s Media Annotation Working Group (MAWG) is to promote interoperability betwee... more The goal of the W3C’s Media Annotation Working Group (MAWG) is to promote interoperability between multimedia metadata formats on the Web. As experienced by everybody, audiovisual data is omnipresent on today’s Web. However, different interaction interfaces and especially diverse metadata formats prevent unified search, access, and navigation. MAWG has addressed this issue by developing an interlingua ontology and an associated API. This article discusses the rationale and core concepts of the ontology and API for media resources. The specifications developed by MAWG enable interoperable contextualized and semantic annotation and search, independent of the source metadata format, and connecting multimedia data to the Linked Data cloud. Some demonstrators of such applications are also presented in this article.
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