Balloon Synopsis: A Modern Node-Centric RDF Viewer and Browser for the Web
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KeywordsLink Data Local Store Semantic Entity SPARQL Endpoint Blank Node
1 RDF Data Is Online - Most RDF Visualizations Are Not
Linked Data and the Semantic Web increase in volume leading to huge amounts of RDF data. Today, even non-experts manage open data, extract semantic information from text and integrate these sources easily in their information system . However, displaying graph-based RDF data in a human-friendly way is challenging.
Human friendly presentation of RDF utilizing a node-centric view and ontology templating.
Automatic enrichment using SPARQL endpoints or automatic query federation over Linked Data.
2 Node-Centric and Human Friendly RDF Visualization
At any time, the user has the possibility to sort, filter and search (using keywords and regular expressions) the displayed tiles to gather information, according to the need of an users. Typically a tile represents low-end information like resource, blank node or literal. This could result in overloaded visualizations, because a specific entity can be included in many different triples. To overcome this issue, balloon Synopsis implements customizable filters. These filters, for example, combine equal predicates and nodes in a common tile or remove irrelevant nodes (blacklist) to simplify the view. Furthermore, developers can easily configure ontology templates to transform data to a human friendly representation. As an example, Fig. 1 shows an instance of ontology templating by viewing a map instead of longitude and latitude coordinates.
3 Prototypic Open Source Implementation
Balloon Synopsis is developed on a modular basis and available as free open source software to support contributions and extensions. Further developments will focus on the collection of ontology templates to continuously enhance the visualizations. A first demonstration as well as the prototypic sources are available at http://schlegel.github.io/balloon/balloon-synopsis.html.
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