Bousi~Prolog: a Prolog Extension Language for Flexible Query Answering

Bousi~Prolog: a Prolog Extension Language for Flexible Query Answering

In this paper we present the main features an implementation details of a programming language that we call Bousi∼Prolog. It can be seen as an extension of Prolog able to deal with similarity-based fuzzy unification (“Bousi” is the Spanish acronym for “fuzzy unification by similarity”). The main goal is the implementation of a declarative programming language well suited for flexible query answ...

A Prolog-based Query Language for OWL

In this paper we investigate how to use logic programming (in particular, Prolog) as query language against OWL resources. Our query language will be able to retrieve data and meta-data about a given OWL based ontology. With this aim, firstly, we study how to define a query language based on a fragment of Description Logic, then we show how to encode the defined query language into Prolog by me...

OWL Query Answering Based on Query Extension

The paper presents an approach for optimizing query answering algorithms that are based on approximate instance retrieval. We consider SPARQL instance queries over OWL ontologies and use the OWL 2 Direct Semantics entailment regime of SPARQL for their evaluation. Approximate query answering algorithms are based on the creation of two sets; the set of certain or known query answers and the set o...

Towards a Flexible Query Language

Defining and processing flexible queries is an important research topic in database area. We may distinguish two ways to support flexible querying in databases: (i) developing interface systems that allow queries in pseudo-natural language, or (ii) developing an extended SQL-like languages. In this paper, we have adopted this second approach. The objective of this paper is to introduce a concep...

CHRv: A Flexible Query Language