SPARQL Aggregate Queries Made Easy with Diagrammatic Query Language ViziQuer
نویسندگان
چکیده
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 the diagrammatic SPARQL extensions powerful enough.
منابع مشابه
ViziQuer: Notation and Tool for Data Analysis SPARQL Queries
We present a UML class diagram style notation for data analysis SPARQL query definition and its implementation in the ViziQuer tool that provides query definition environment and query translation into SPARQL 1.1. The notation and its implementation within the tool allows for rich value selection and condition expression language, as well as integrated data aggregation facilities, both essentia...
متن کاملExtended UML Class Diagram Constructs for Visual SPARQL Queries in ViziQuer/web
Visual notations based on customized entity relationship and basic UML class diagram paradigm of classes, associations and attributes are successfully used in data modeling and data querying alike, both in relational database and in semantic/conceptual model setting. We propose a number of constructs for extending the basic diagrammatic framework in the setting of visual specification of SPARQL...
متن کاملTowards Graphical Query Notation for Semantic Databases
We describe a notation and a tool for schema-enabled visual/diagrammatic creation of SPARQL queries over RDF databases. The notation and the tool support both the standard basic query pattern comprising a main query class and possibly linked condition classes and means for aggregate query definition and placing conditions over aggregates including also aggregation of aggregate results. We discu...
متن کاملQuery by Diagram: a Visual Environment for Querying Databases
In recent years, several attempts have been made to define query languages characterized by both high expressive power and easy query formulation. Several issues concern graphical applications, based on the diagrammatic representation of a semantic model and visual interaction. This paper describes the architecture and the implementation of a graphical query system, based on the diagrammatic re...
متن کاملREHABROBO-QUERY: Answering Natural Language Queries about Rehabilitation Robotics Ontology on the Cloud
We introduce a novel method to answer natural language queries about rehabilitation robotics, over the formal ontology REHABROBO-ONTO. For that, (i) we design and develop a novel controlled natural language for rehabilitation robotics, called REHABROBO-CNL; (ii) we introduce translations of queries in REHABROBO-CNL into SPARQL queries, utilizing a novel concept of query description trees and de...
متن کامل