Mapping fuzzy RDF(S) into fuzzy object‐oriented databases

Abstract

The Resource Description Framework (RDF) and RDF Schema (RDFS), being a recommendation of World Wide Web Consortium (W3C), have been widely used to exchange and reason information about resources on the web. It is a common case that information about resources may be uncertain under an environment of open web. To deal with uncertainties in resource information, we propose, in this paper, a general fuzzy RDF(S) model, which contains a fuzzy RDFS layer and a fuzzy RDF layer. In particular, we investigate how to formally map the fuzzy RDF(S) model to the fuzzy object‐oriented database model in the paper. We develop mapping rules and implement a prototype system to demonstrate the feasibility of our approach.

Ontological Ship Behavior Modeling Based on COLREGs for Knowledge Reasoning

“…Thus, researchers intend to gain knowledge of ship behavior from semantic knowledge. Expert systems [16], expression logic [17], semantic network [18], the Resource Description Framework (RDF) [19], ontology [20], etc. are popular methods to construct knowledge and realize knowledge reasoning.…”

Storing and querying fuzzy RDF(S) in HBase databases

“…Definition 1 (Fuzzy RDF(S) graph 36 ). Fuzzy RDF(S) data graph G F is represented by a seven-tuple FR = {3×, E, Σ, L, μ, ρ, A}.…”

“…Including both fuzzy RDF syntax and fuzzy RDF semantics, a more general fuzzy RDF model is proposed in Lv et al 3 In contrast to Mazzieri, 34 in Lv et al, 3 three elements of triples (ie, subject, predicate, and object) are annotated with separate membership degrees in [0, 1]. And a general fuzzy RDF graph model that combines the fuzziness of vertices label value and edge is proposed in Ma et al 35 The fuzzy RDF(S) graph model proposed in Fan et al 36 covers both fuzzy RDF and fuzzy RDFS. Considering that it is a very common case that the fuzziness of triples occurs only in the object component, in Ma and Yan, 37 only one element of triples (eg, object) is annotated with a membership degree in [0, 1].…”

“…In Ma and Yan, 37 apply the fuzzy relational database model to store the fuzzy RDF triples, in which the object component of the fuzzy triples are annotated with a membership degree in [0, 1]. Considering the storage of fuzzy RDFS in addition to fuzzy RDF triples, in Fan et al, 36 the object‐oriented database model is applied to store the fuzzy RDF(S) data. Like the situation of crisp RDF(S) storage in databases, the fuzzy relational databases and fuzzy object‐oriented databases cannot effectively support large‐scale fuzzy RDF(S) data management.…”

“…With the fuzzy RDF(S) model proposed in Fan et al, 36 in this paper, we present a distributed fuzzy RDF(S) storage approach based on HBase databases. This approach makes use of the index function of HBase databases.…”