A Minimal Deductive System for General Fuzzy RDF

Abstract

Abstract. It is well-known that crisp RDF is not suitable to represent vague information. Fuzzy RDF variants are emerging to overcome this limitations. In this work we provide, under a very general semantics, a deductive system for a salient fragment of fuzzy RDF. We then also show how we may compute the top-k answers of the union of conjunctive queries in which answers may be scored by means of a scoring function.

Interactive Exploration of Fuzzy RDF Knowledge Bases

“…Furthermore, we could have fuzziness and we can consider this as an independent aspect (e.g. there are fuzzy extensions of the RDF model such as [10,16] Fig. 3 shows the above categories organized hierarchically where an option X is a (direct or indirect) child of an option Y if whatever information can be expressed in Y can also be expressed in X.…”

“…For a property p ∈ P r we can define the edges , o ) is not directly supported), storing it into a relational DB, and then using internally SQL queries. For instance, [16] uses MonetDB with the following schema: type(subject, object, degree), subclassOf(subject, object, degree), subpropertyOf(subject, object, degree), and a table prop i (subject, object, degree) for every distinct property p i . Table 2 shows directly the SQL queries that are needed by our interaction model for Fuzzy RDF (again E could also be defined through another query).…”

“…Note that various approaches have been proposed recently for annotating triples with a degree of truth and giving a semantics to such annotations, e.g. [16,18], and can be used as the representation framework. Among the various possible approaches for exploiting fuzzy degrees at the interaction level, we propose one based on intervals, leading to a simple and intuitive dialog.…”

Large Scale Fuzzy pD * Reasoning Using MapReduce

“…Since the running time should be inversely proportional to the speed, after eliminating the effect of the platform overhead, the system's performance speeds up linearly to the increase of number of units. [10] is the first work to extend RDFS with fuzzy vagueness. In [4], we further propose the fuzzy pD * semantics which allows some useful OWL vocabularies, such as TransitiveProperty and SameAs.…”

Practical RDF Schema Reasoning with Annotated Semantic Web Data

“…Briefly, an annotation v from a suitable mathematical structure is added to the ordinary triples (s p o) obtaining (s p o) : v, annotating with v the statement that subject s is related via property p to object o. The general semantics of this RDFS extension has been recently addressed [21,22] improving the initial work of [26], but only a memory-based Prolog implementation is available.…”