Visualization is a promising technique for both enhancing users’ perception of structure in the Internet and providing navigation facilities for its large information spaces. This paper describes an application of the Document Explorer to the visualization of WWW content structure. The system provides visualization, browsing, and query formulation mechanisms based on documents’ semantic content...

Visualization is a promising technique for both enhancing users’ perception of structure in the Internet and providing navigation facilities for its large information spaces. This paper describes an application of the Document Explorer to the visualization of WWW content structure. The system provides visualization, browsing, and query formulation mechanisms based on documents’ semantic content...

In this paper we investigate a relation between modern hypertext approaches and conventional data modelling techniques, such as PSM. This relation provides us with the mechanism of query by navigation, in order to facilitate the query formulation problem.

Visual methods for query formulation undertake the challenge of making querying independent of users’ technical skills and the knowledge of the underlying textual query language and the structure of data. In this paper, we demonstrate an ontology-based visual query system, namely OptiqueVQS, which we have been developing for end users within a large industrial project.

The query synchronization is one of main issues of schema evolution: when a schema evolves the existing queries could stop working and it becomes necessary to redefine them over the new schema. In this paper, according to the recently recognized importance of advanced query formulation interfaces, the basic ideas and components underlying an interactive model of tool for supporting query synchr...

The use of graph databases for social networks, images, web links, pathways and so on, has been increasing at a fast pace and promotes the need for efficient graph query processing on such databases. In this study, we discuss graph query processing – referred to as graph matching – and an inherent optimization problem known as the minimum hub cover problem. This optimization problem is introduc...

We present a novel way to draw SPARQL aggregate queries via diagrammatic query language – ViziQuer. Since the introduction of SPARQL different graphical languages have been proposed to make SPARQL more userfriendly. In SPARQL 1.1 aggregate queries were introduced that are key to meaningful query formulation. However, diagrammatic query languages lacked this important end-user feature to make th...

This paper proposes machine learning techniques to discover knowledge in a dataset in the form of if-then rules for the purpose of formulating queries for validation of a Bayesian belief network model of the same data. Although domain expertise is often available, the query formulation task is tedious and laborious, and hence automation of query formulation is desirable. In an effort to automat...