Search Results for author: Maria-Esther Vidal

Found 15 papers, 8 papers with code

Scaling Up Knowledge Graph Creation to Large and Heterogeneous Data Sources

no code implementations24 Jan 2022 Enrique Iglesias, Samaneh Jozashoori, Maria-Esther Vidal

Given a set of mapping assertions, the planner provides an optimized execution plan by partitioning and scheduling the execution of the assertions.

Knowledge Graphs Management +1

EABlock: A Declarative Entity Alignment Block for Knowledge Graph Creation Pipelines

1 code implementation14 Dec 2021 Samaneh Jozashoori, Ahmad Sakor, Enrique Iglesias, Maria-Esther Vidal

Mapping languages, e. g., RML and R2RML, facilitate declarative specification of the process of applying meta-data and integrating data into a knowledge graph.

Entity Alignment Knowledge Graphs

Trav-SHACL: Efficiently Validating Networks of SHACL Constraints

1 code implementation18 Jan 2021 Mónica Figuera, Philipp D. Rohde, Maria-Esther Vidal

Trav-SHACL reorders the shapes in a shape schema for efficient validation and rewrites target and constraint queries for the fast detection of invalid entities.

Knowledge Graphs Databases

FunMap: Efficient Execution of Functional Mappings for Knowledge Graph Creation

1 code implementation31 Aug 2020 Samaneh Jozashoori, David Chaves-Fraga, Enrique Iglesias, Maria-Esther Vidal, Oscar Corcho

We propose FunMap, an interpreter of function-based mapping languages; it relies on a set of lossless rewriting rules to push down and materialize the execution of functions in initial steps of knowledge graph creation.

Databases

SDM-RDFizer: An RML Interpreter for the Efficient Creation of RDF Knowledge Graphs

1 code implementation17 Aug 2020 Enrique Iglesias, Samaneh Jozashoori, David Chaves-Fraga, Diego Collarana, Maria-Esther Vidal

In recent years, the amount of data has increased exponentially, and knowledge graphs have gained attention as data structures to integrate data and knowledge harvested from myriad data sources.

Databases

Optimizing Federated Queries Based on the Physical Design of a Data Lake

no code implementations19 Feb 2020 Philipp D. Rohde, Maria-Esther Vidal

However, state-of-the-art query engines for federated query processing over Semantic Data Lakes often rely on optimization techniques tailored for RDF.

Databases

Enhancing Virtual Ontology Based Access over Tabular Data with Morph-CSV

1 code implementation24 Jan 2020 David Chaves-Fraga, Edna Ruckhaus, Freddy Priyatna, Maria-Esther Vidal, Oscar Corcho

In the specific case of tabular datasets represented as several CSV or Excel files, query translation approaches have been applied by considering each source as a single table that can be loaded into a relational database management system (RDBMS).

Databases

Falcon 2.0: An Entity and Relation Linking Tool over Wikidata

1 code implementation24 Dec 2019 Ahmad Sakor, Kuldeep Singh, Anery Patel, Maria-Esther Vidal

The Natural Language Processing (NLP) community has significantly contributed to the solutions for entity and relation recognition from the text, and possibly linking them to proper matches in Knowledge Graphs (KGs).

Knowledge Graphs Language Modelling +2

Towards Optimisation of Collaborative Question Answering over Knowledge Graphs

no code implementations14 Aug 2019 Kuldeep Singh, Mohamad Yaser Jaradeh, Saeedeh Shekarpour, Akash Kulkarni, Arun Sethupat Radhakrishna, Ioanna Lytra, Maria-Esther Vidal, Jens Lehmann

Collaborative Question Answering (CQA) frameworks for knowledge graphs aim at integrating existing question answering (QA) components for implementing sequences of QA tasks (i. e. QA pipelines).

feature selection Knowledge Graphs +1

No One is Perfect: Analysing the Performance of Question Answering Components over the DBpedia Knowledge Graph

3 code implementations26 Sep 2018 Kuldeep Singh, Ioanna Lytra, Arun Sethupat Radhakrishna, Saeedeh Shekarpour, Maria-Esther Vidal, Jens Lehmann

Question answering (QA) over knowledge graphs has gained significant momentum over the past five years due to the increasing availability of large knowledge graphs and the rising importance of question answering for user interaction.

Knowledge Graphs Question Answering

Cannot find the paper you are looking for? You can Submit a new open access paper.