0000000000801197

AUTHOR

Jūlija Ovčiņņikova

showing 9 related works from this author

Extensible Visualizations of Ontologies in OWLGrEd

2019

OWLGrEd is a visual editor for OWL 2.0 ontologies that combines UML class diagram notation and textual OWL Manchester syntax for expressions. We review the basic OWLGrEd options for ontology presentation customization and consider the framework of OWLGrEd extensions that enables introducing rich use-case specific functionality to the editor. A number of available OWLGrEd extensions offering rich ontology management features to their end-users are described, as well.

Syntax (programming languages)Computer scienceProgramming languagemedia_common.quotation_subject010401 analytical chemistry02 engineering and technologyOntology (information science)computer.software_genreNotation01 natural sciencesExtensibility0104 chemical sciencesPersonalizationPresentation0202 electrical engineering electronic engineering information engineering020201 artificial intelligence & image processingClass diagramVisual editorcomputermedia_common
researchProduct

Towards Graphical Query Notation for Semantic Databases

2015

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 discuss the applicability of the tool for ad-hoc query formulation in practical use cases.

Web search queryInformation retrievalComputer scienceInformationSystems_INFORMATIONSTORAGEANDRETRIEVALAggregate (data warehouse)InformationSystems_DATABASEMANAGEMENTcomputer.file_formatQuery languageQuery optimizationNotationSPARQLSargableQuery by Examplecomputercomputer.programming_language
researchProduct

ViziQuer: A Web-Based Tool for Visual Diagrammatic Queries Over RDF Data

2018

We demonstrate the open source ViziQuer tool for web-based creation and execution of visual diagrammatic queries over RDF/SPARQL data. The tool supports the data instance level and statistics queries, providing visual counterparts for most of SPARQL 1.1 select query constructs, including aggregation and subqueries. A query environment can be created over a user-supplied SPARQL endpoint with known data schema (a data schema exploration service is available, as well). There are pre-defined demonstration query environments for a mini-university data set, a fragment of synthetic similar to reality hospital data set, and a variant of Linked Movie Database RDF data set.

Service (systems architecture)Information retrievalbusiness.industryComputer scienceInformationSystems_INFORMATIONSTORAGEANDRETRIEVAL010401 analytical chemistry05 social sciencesDatabase schemaInformationSystems_DATABASEMANAGEMENTcomputer.file_format01 natural sciences0104 chemical sciencesData setDiagrammatic reasoningFragment (logic)SPARQLWeb application0501 psychology and cognitive sciencesRDFbusinesscomputer050107 human factors
researchProduct

Schema-Backed Visual Queries over Europeana and Other Linked Data Resources

2021

We describe and demonstrate the process of extracting a data-driven schema of the Europeana cultural heritage Linked data resource (with actual data classes, properties and their connections, and cardinalities) and application of the extracted schema to create a visual query environment over Europeana. The extracted schema information allows generating SHACL data shapes describing the actual data endpoint structure. The schema extraction process can be applied also to other data endpoints with a moderate data schema size and a potentially large data triple count, as e.g., British National Bibliography Linked data resource.

Schema (genetic algorithms)Structure (mathematical logic)Information retrievalResource (project management)Computer scienceProcess (engineering)Database schemaSPARQLcomputer.file_formatLinked dataRDFcomputer
researchProduct

Schema-Based Visual Queries over Linked Data Endpoints

2019

We present the option to use the schema-based visual query tool ViziQuer over realistic Linked Data endpoints. We describe the tool meta-schema structure and the means for the endpoint schema retrieval both from an OWL ontology and from a SPARQL endpoint. We report on a store of the endpoint-specific schemas and the options to support the schema presentation to the end-user both as a class tree within the environment and as external visual diagram.

Information retrievalComputer science05 social sciencesDatabase schemaInformationSystems_DATABASEMANAGEMENTWeb Ontology LanguageLinked datacomputer.file_formatSchema (psychology)ComputingMethodologies_DOCUMENTANDTEXTPROCESSINGSPARQL0501 psychology and cognitive sciencesVisual queryRDFcomputer050107 human factors050104 developmental & child psychologycomputer.programming_language
researchProduct

ViziQuer: A Visual Notation for RDF Data Analysis Queries

2019

Visual SPARQL query notations aim at easing the RDF data querying task. At the current state of the art there is still no generally accepted visual graph-based notation suitable to describe RDF data analysis queries that involve aggregation and subqueries. In this paper we present a visual diagram-centered notation for SPARQL select query formulation, capable to handle aggregate/statistics queries and hierarchic queries with subquery structure. The notation is supported by a web-based prototype tool. We present the notation examples, describe its syntax and semantics and describe studies with possible end users, involving both IT and medicine students.

Computer scienceEnd userProgramming languageInformationSystems_INFORMATIONSTORAGEANDRETRIEVAL010401 analytical chemistry05 social sciencesQuery formulationInformationSystems_DATABASEMANAGEMENTcomputer.file_formatNotationcomputer.software_genre01 natural sciences0104 chemical sciencesSPARQLGraph (abstract data type)0501 psychology and cognitive sciencesVisual notationRDFcomputer050107 human factors
researchProduct

Lietotāja definētu lauku mehānisms TDA rīku būves platformā

2012

Darbā ietvaros ir izstrādāts un realizēts mehānisms lietotāju definēto lauku un skatījumu pievienošanai TDA rīku būves platformā veidotiem grafiskiem rīkiem. Mehānisms sniedz iespēju papildināt rīku notācijas ar jauniem vizuāliem elementiem un nodrošināt to semantikas definēšanu, kā arī nodrošināt lietotājiem iespēju mainīt diagrammas elementu un atribūtu izskatu. Izstrādātais mehānisms ir pārbaudīts OWLGrEd rīkā, definējot domēn-specifiskas OWL ontoloģiju vizualizācijas notācijas.

Datorzinātne
researchProduct

Spraudņi un to lietojumi TDA rīku būves platformā

2014

Darba mērķis ir izstrādāt un aprakstīt spraudņus OWLGrEd redaktoram, kas papildina OWLGrEd redaktora notāciju klāstu. Darbā aprakstīti šādi realizēti spraudņi: Ontoloģiju un relāciju datubāzes atbilstības anotāciju definēšanai klasēm, objektiem un datu īpašībām, un priekšā-teikšanai; OBIS (Ontology based information system) automātiski ģenerētas lietotāja saskarnes anotāciju uzdošanai; OWL Mančestras izteiksmju priekšā-teikšanai; Ontoloģijas leksikalizācijai dažādās valodās, izmantojot kontrolētu dabisko valodu (CNL, Controlled Natural Language); Ielādētas ontoloģijas vienkāršošanai. Darbā izpētīta un realizēta uz gramatikām balstīta priekšā-teicēja funkcionalitāte TDA platformas veidotiem …

Datorzinātne
researchProduct

Prezentācijas servisi UML/OWL redaktorā

2010

„Prezentācijas serviss UML/OWL redaktorā” ir UML/OWL redaktora sastāvdaļa, kas ir paredzēta, lai lietotājiem atvieglotu informācijas meklēšanu redaktora grafiskajā diagrammā, vienlaicīgi nodrošinot grafiskās diagrammas datu rediģēšanu, pievienošanu un dzēšanu. Lietotājiem tiek nodrošināta iespēja veidot vairākus režīmus, kas atspoguļo noteiktus grafiskās diagrammas datus tabulas veida formā. Ir nodrošināta iespēja apskatīties visas pieejamas grafiskās diagrammas klases īpašības, noteiktas kopas klašu īpašības vai vienas klases īpašības. Tapāt lietotājiem tiek nodrošināta iespēja izvēlēties kādas tieši klases īpašības viņiem ir nepieciešamas.

Datorzinātne
researchProduct