David Chaves-Fraga
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View article: Declarative Generation of RDF Collections and Containers from Heterogeneous Data
Declarative Generation of RDF Collections and Containers from Heterogeneous Data Open
Purpose: This paper addresses the lack of practical support for generating RDF Collections and Containers from heterogeneous sources in existing mapping tools with the RDF Mapping Language (RML). While the RML Collections and Container (CC…
View article: Normalization-Driven Optimization of Knowledge Graph Creation for Semantically Grounded Information Fusion
Normalization-Driven Optimization of Knowledge Graph Creation for Semantically Grounded Information Fusion Open
View article: When Ontologies Met Knowledge Graphs: Tale of a Methodology
When Ontologies Met Knowledge Graphs: Tale of a Methodology Open
View article: From Genesis to Maturity: Managing Knowledge Graph Ecosystems Through Life Cycles
From Genesis to Maturity: Managing Knowledge Graph Ecosystems Through Life Cycles Open
Knowledge graphs (KGs) play a crucial role in the integration and organization of heterogeneous data and knowledge, enabling advanced data analytics and decision-making across various industries. This vision paper addresses critical challe…
View article: Mapeathor: Simplifying the Specification of Declarative Rules for Knowledge Graph Construction
Mapeathor: Simplifying the Specification of Declarative Rules for Knowledge Graph Construction Open
Bug fix release for templates: Quotes in iterator for YARRRML Deleting extra bracket in functions
View article: Empowering the SDM-RDFizer tool for scaling up to complex knowledge graph creation pipelines1
Empowering the SDM-RDFizer tool for scaling up to complex knowledge graph creation pipelines1 Open
The significant increase in data volume in recent years has prompted the adoption of knowledge graphs as valuable data structures for integrating diverse data and metadata. However, this surge in data availability has brought to light chal…
View article: Declarative generation of RDF-star graphs from heterogeneous data
Declarative generation of RDF-star graphs from heterogeneous data Open
RDF-star has been proposed as an extension of RDF to make statements about statements. Libraries and graph stores have started adopting RDF-star, but the generation of RDF-star data remains largely unexplored. To allow generating RDF-star …
View article: Evo-KnoMo: How to Evolve with the Current Times
Evo-KnoMo: How to Evolve with the Current Times Open
<p><strong>Abstract</strong><br>\nOur society is currently divided into two knowledge ecosystems. Know4All, as a public decentralized initiative, shares knowledge between peers under demand, while the private ecosys…
View article: KGCW 2023 Challenge @ ESWC 2023
KGCW 2023 Challenge @ ESWC 2023 Open
<h1><strong>Knowledge Graph Construction Workshop 2023: challenge</strong></h1>\n<p>Knowledge graph construction of heterogeneous data has seen a lot of uptake<br>in the last decade from compliance to pe…
View article: KGCW 2023 Challenge @ ESWC 2023
KGCW 2023 Challenge @ ESWC 2023 Open
Knowledge Graph Construction Workshop 2023: challenge Knowledge graph construction of heterogeneous data has seen a lot of uptake in the last decade from compliance to performance optimizations with respect to execution ti…
View article: KGCW 2023 Challenge @ ESWC 2023
KGCW 2023 Challenge @ ESWC 2023 Open
Knowledge Graph Construction Workshop 2023: challenge Knowledge graph construction of heterogeneous data has seen a lot of uptakein the last decade from compliance to performance optimizations with respectto execution time. Besides executi…
View article: The RML Ontology: A Community-Driven Modular Redesign After a Decade of Experience in Mapping Heterogeneous Data to RDF
The RML Ontology: A Community-Driven Modular Redesign After a Decade of Experience in Mapping Heterogeneous Data to RDF Open
View article: An ontological approach for representing declarative mapping languages
An ontological approach for representing declarative mapping languages Open
Knowledge Graphs are currently created using an assortment of techniques and tools: ad hoc code in a programming language, database export scripts, OpenRefine transformations, mapping languages, etc. Focusing on the latter, the wide variet…
View article: Systematic Construction of Knowledge Graphs for Research-Performing Organizations
Systematic Construction of Knowledge Graphs for Research-Performing Organizations Open
Research-Performing Organizations (e.g., research centers, universities) usually accumulate a wealth of data related to their researchers, the generated scientific results and research outputs, and publicly and privately-funded projects th…
View article: Editorial of transport data on the web
Editorial of transport data on the web Open
View article: Morph-KGC: Scalable knowledge graph materialization with mapping partitions
Morph-KGC: Scalable knowledge graph materialization with mapping partitions Open
Knowledge graphs are often constructed from heterogeneous data sources, using declarative rules that map them to a target ontology and materializing them into RDF. When these data sources are large, the materialization of the entire knowle…
View article: Adaptación de estructuras de conjuntos de datos para asegurar su calidad. Aplicación a conjuntos de datos de Madrid. Informe técnico del proyecto Ciudades Abiertas
Adaptación de estructuras de conjuntos de datos para asegurar su calidad. Aplicación a conjuntos de datos de Madrid. Informe técnico del proyecto Ciudades Abiertas Open
En este documento se presenta el trabajo realizado para demostrar la aplicación del marco de evaluación de calidad propuesto en el informe “Adaptación de estructuras de conjuntos de datos para asegurar su calidad y anonimización” sobre 10 …
View article: Adaptación de estructuras de conjuntos de datos para asegurar su calidad. Aplicación a conjuntos de datos de Madrid. Informe técnico del proyecto Ciudades Abiertas
Adaptación de estructuras de conjuntos de datos para asegurar su calidad. Aplicación a conjuntos de datos de Madrid. Informe técnico del proyecto Ciudades Abiertas Open
En este documento se presenta el trabajo realizado para demostrar la aplicación del marco de evaluación de calidad propuesto en el informe “Adaptación de estructuras de conjuntos de datos para asegurar su calidad y anonimización” sobre 10 …
View article: Handling qualitative preferences in SPARQL over virtual ontology-based data access
Handling qualitative preferences in SPARQL over virtual ontology-based data access Open
With the increase of data volume in heterogeneous datasets that are being published following Open Data initiatives, new operators are necessary to help users to find the subset of data that best satisfies their preference criteria. Quanti…
View article: Knowledge Graph Construction from Heterogeneous Data Sources exploiting Declarative Mapping Rules
Knowledge Graph Construction from Heterogeneous Data Sources exploiting Declarative Mapping Rules Open
Over the last years, a large and constant growth of data have been made available on the Web. These data are published in many different formats following several schemes. The Semantic Web, and more in detail the Knowledge Graphs, have gai…
View article: Enhancing virtual ontology based access over tabular data with Morph-CSV
Enhancing virtual ontology based access over tabular data with Morph-CSV Open
Ontology-Based Data Access (OBDA) has traditionally focused on providing a unified view of heterogeneous datasets (e.g., relational databases, CSV and JSON files), either by materializing integrated data into RDF or by performing on-the-fl…
View article: Knowledge Graph Construction with R2RML and RML: An ETL System-based Overview
Knowledge Graph Construction with R2RML and RML: An ETL System-based Overview Open
Knowledge graphs have proven to be a powerful technology to integrate and structure the myriad of data available nowadays. The semantic web community has actively worked on data integration systems, providing an important set of engines an…
View article: A High-Level Ontology Network for ICT Infrastructures
A High-Level Ontology Network for ICT Infrastructures Open
View article: RML-star : a declarative mapping language for RDF-star generation
RML-star : a declarative mapping language for RDF-star generation Open
RDF-star was recently proposed as a convenient representation to annotate statements in RDF with metadata by introducing the so-called RDF-star triples, bridging the gap between RDF and property graphs. However, even though there are many …
View article: Drugs4Covid: Drug-driven Knowledge Exploitation based on Scientific Publications
Drugs4Covid: Drug-driven Knowledge Exploitation based on Scientific Publications Open
In the absence of sufficient medication for COVID patients due to the increased demand, disused drugs have been employed or the doses of those available were modified by hospital pharmacists. Some evidences for the use of alternative drugs…
View article: SDM-TIB/FunMap: v1.0
SDM-TIB/FunMap: v1.0 Open
Version v1.0 used for ISWC2020 Research Track
View article: GTFS-Madrid-Bench: A benchmark for virtual knowledge graph access in the transport domain
GTFS-Madrid-Bench: A benchmark for virtual knowledge graph access in the transport domain Open
A large number of datasets are being made available on the Web using a variety of formats and according to diverse data models. Ontology Based Data Integration (OBDI) has been traditionally proposed as a mechanism to facilitate access to s…
View article: Enhancing OBDA Query Translation over Tabular Data with Morph-CSV.
Enhancing OBDA Query Translation over Tabular Data with Morph-CSV. Open
Ontology-Based Data Access (OBDA) has traditionally focused on providing a unified view of heterogeneous datasets (e.g., relational database, CSV, JSON), either by materializing integrated data into RDF or by performing on-the-fly integrat…
View article: FunMap: Efficient Execution of Functional Mappings for Knowledge Graph Creation
FunMap: Efficient Execution of Functional Mappings for Knowledge Graph Creation Open
View article: Towards a new generation of ontology based data access
Towards a new generation of ontology based data access Open
Ontology Based Data Access (OBDA) refers to a range of techniques, algorithms and systems that can be used to deal with the heterogeneity of data that is common inside many organisations as well as in inter-organisational settings and more…