Sindice.com: a document-oriented lookup index for open linked data

Oren, Eyal; Delbru, Renaud; Catasta, Michele; Cyganiak, Richard; Stenzhorn, Holger; Tummarello, Giovanni

doi:10.1504/ijmso.2008.021204

Cited by 251 publications

(178 citation statements)

References 40 publications

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“…This is particularly the case today, as the significant increase in the number of ontologies available online means that ontology engineering projects often include a reuse activity, where people first locate ontologies which may be relevant to their project -e.g., by using ontology search engines, such as Sindice [1] or Watson [2], and then examine them to understand to what extent they provide solutions to their modelling needs.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Visualizing and Navigating Ontologies

Motta

Mulholland

Peroni

et al. 2011

Lecture Notes in Computer Science

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Abstract. Observational studies in the literature have highlighted low levels of user satisfaction in relation to the support for ontology visualization and exploration provided by current ontology engineering tools. These issues are particularly problematic for non-expert users, who rely on effective tool support to abstract from representational details and to be able to make sense of the contents and the structure of ontologies. To address these issues, we have developed a novel solution for visualizing and navigating ontologies, KC-Viz, which exploits an empirically-validated ontology summarization method, both to provide concise views of large ontologies, and also to support a 'middle-out' ontology navigation approach, starting from the most information-rich nodes (key concepts). In this paper we present the main features of KC-Viz and also discuss the encouraging results derived from a preliminary empirical evaluation, which suggest that the use of KC-Viz provides performance advantages to users tackling realistic browsing and visualization tasks. Supplementary data gathered through questionnaires also convey additional interesting findings, including evidence that prior experience in ontology engineering affects not just objective performance in ontology engineering tasks but also subjective views on the usability of ontology engineering tools.

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Section: Introductionmentioning

confidence: 99%

A Novel Approach to Visualizing and Navigating Ontologies

Motta

Mulholland

Peroni

et al. 2011

Lecture Notes in Computer Science

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show abstract

“…Regarding the use of an RDF schema (RDFS [5]), the space of instances is sparsely populated, since most classes and properties have never been instantiated. By crawling the Web, Oren [19] comes to similar conclusions, showing that resources (URIs) in different documents fit to a power-law distribution. Theoharis [21] studies these properties for Semantic Web schemas, RDFS and OWL [16].…”

Section: … Compressionmentioning

confidence: 84%

“…Regarding the structure of RDF real-world data, several studies point to the presence of power-law distribution, in term frequencies [10], resources [19] and schemas [21].…”

Section: … Compressionmentioning

confidence: 99%

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Compact Representation of Large RDF Data Sets for Publishing and Exchange

Fernández

Martínez‐Prieto

Gutiérrez

2010

Lecture Notes in Computer Science

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Abstract. Increasingly huge RDF data sets are being published on the Web. Currently, they use different syntaxes of RDF, contain high levels of redundancy and have a plain indivisible structure. All this leads to fuzzy publications, inefficient management, complex processing and lack of scalability. This paper presents a novel RDF representation (HDT) which takes advantage of the structural properties of RDF graphs for splitting and representing, efficiently, three components of RDF data: Header, Dictionary and Triples structure. On-demand management operations can be implemented on top of HDT representation. Experiments show that data sets can be compacted in HDT by more than fifteen times the current naive representation, improving parsing and processing while keeping a consistent publication scheme. For exchanging, specific compression techniques over HDT improve current compression solutions.

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“…At runtime, the Web user can directly provide a URL to an existing Linked Data resource in the Textbox which is used by the client-side JS API to retrieve the RDF graph and pre-fill the form controls in the widget if the data exists in the resource graph. Alternatively, the user can type in a search term which the client-side JS API uses for a call to the Sindice API [18] which in turn returns an RDF graph that is again used to pre-fill the remaining form controls. In either case, if a URI to an external resource is provided the underlying owl:sameAs relations for this form control asserts that the graph representing the user's input data its URI assigned by ActiveRaUL is the same individual having a different URI in the Linked Data Web.…”

Section: Data Reusementioning

confidence: 99%

Interacting with Linked Data via Semantically Annotated Widgets

2012

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Abstract. The continuous growth of the Linked Data Web brings us closer to the original vision of the Web as an interconnected network of machinereadable resources. There is, however, an essential aspect in principle still missing from this vision, i.e., the ability for the Web user to interact directly with the Linked Data in a read/write manner. In this paper we introduce a lifecycle and associated mechanism to enable a domain-agnostic read/write interaction with Linked Data in the context of a single data provider. Our solution uses an ontology to build a binding front-end for a given RDF model, in addition to RDFa to maintain the semantics of the resulting form/widget components. On the processing side, a RESTful Web service is provided to seamlessly manage semantic widgets and their associated data, and hence enable the read/write data interaction mechanism. The evaluation shows that the generation process presents no performance issues, while the content overhead required for the actual form-data binding is kept to a minimum.

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Sindice.com: a document-oriented lookup index for open linked data

Cited by 251 publications

References 40 publications

A Novel Approach to Visualizing and Navigating Ontologies

A Novel Approach to Visualizing and Navigating Ontologies

Compact Representation of Large RDF Data Sets for Publishing and Exchange

Interacting with Linked Data via Semantically Annotated Widgets

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