Distributed knowledge sharing and production through collaborative e-Science platforms. (Partage et production de connaissances distribuées dans des plateformes scientifiques collaboratives)
نویسنده
چکیده
knowledge graphs have been introduced in [Corby and Faron-Zucker, 2010] through the KGRAM framework. They result from an initiative [Dieng-Kuntz and Corby, 2005] aimed at easing the design of semantic web applications through conceptual graphs (CGs) [Sowa, 1984]. They are particularly well suited in the context of collaborative lifescience platforms since (i) they allow representing and querying semantic data (such as standard RDF data and RDFS controlled vocabularies) and (ii) they allow addressing structural data source heterogeneity as soon as a graph-based view on the underlying data structure can be provided. In spite of subtle differences [Dieng-Kuntz and Corby, 2005], the mapping between RDF data and Abstract Knowledge Graphs was almost straightforward: RDF(S) Abstract Knowledge Graphs RDFS class Concept as a node RDF(S) property Relations as directed labelled edges RDF graph Abstract Knowledge Graph RDF resource (subject or object) Node RDF predicate Node RDF triple Directed labelled edge Table 4.1: Mapping between RDF(S) and abstract knowledge graph representations The Knowledge Graph Abstract Machine [Corby and Faron-Zucker, 2010] (KGRAM) is a framework aimed at representing, querying and reasoning over semantic data represented as abstract knowledge graphs2. KGRAM interprets an abstract language which generalizes SPARQL 1.1, thus benefiting from its high expressivity (aggregate functions, subqueries, negations and property paths). To mediate several, possibly heterogeneous data sources, KGRAM introduces a set of abstract operators manipulating abstract graph data structures (abstract Nodes and Edges forming abstract Graphs). Graphs are navigated through Producers responsible for the iteration over Nodes and Edges, thus acting as graph mediators. For each kind of data source, a specific Producer is needed that abstracts its representation provided that it is able to produce a graph view of hosted data. 2KGRAM is part of the Corese [Corby and Faron-Zucker, 2010] Semantic Web Factory. te l-0 08 38 79 6, v er si on 1 26 J un 2 01 3 4.2. Strategies for semantic query distribution 75
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