Browsing by Author "Angles, Renzo"

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    MillenniumDB: An Open-Source Graph Database System
    (Springer International Publishing, 2023) Vrgoc, Domagoj; Rojas, Carlos; Angles, Renzo; Arenas, Marcelo; Arroyuelo, Diego; Buil-Aranda, Carlos; Hogan, Aidan; Navarro, Gonzalo; Riveros, Cristian; Romero, Juan
    In this systems paper, we present MillenniumDB: a novel graph database engine that is modular, persistent, and open source. MillenniumDB is based on a graph data model, which we call domain graphs, that provides a simple abstraction upon which a variety of popular graph models can be supported, thus providing a flexible data management engine for diverse types of knowledge graph. The engine itself is founded on a combination of tried and tested techniques from relational data management, state-of-the-art algorithms for worst-case-optimal joins, as well as graph-specific algorithms for evaluating path queries. In this paper, we present the main design principles underlying MillenniumDB, describing the abstract graph model and query semantics supported, the concrete data model and query syntax implemented, as well as the storage, indexing, query planning and query evaluation techniques used. We evaluate MillenniumDB over real-world data and queries from the Wikidata knowledge graph, where we find that it outperforms other popular persistent graph database engines (including both enterprise and open source alternatives) that support similar query features.
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    Telar and TelarKG: Data-Driven Insights into Chile’s Constitutional Process
    (2024) Angles, Renzo; Bro, Naim; Donoso Guzman, Ivania Nadine; Luna Farina, Juan Pablo; Hogan, Aidan; Reutter De La Maza, Juan Lorenzo; Rosales-Méndez, Henry; Toro, Sergio
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    TelarKG: a knowledge graph of Chile's constitutional process
    (2024) Angles, Renzo; Calisto, Vicente; Díaz, Javiera; Ferrada, Sebastián; Hogan, Aidan; Pinto, Alexander; Reutter de la Maza, Juan Lorenzo; Rojas, Carlos; Rosales-Méndez, Henry; Sarmiento, Hernán; Toussaint, Etienne; Vrgoc Domagoj
    In this paper we present TelarKG, a knowledge graph (KG) that consolidates multiple sources of information regarding the Chilean Constitutional process, particularly about the work of the members of the Constitutional Convention. TelarKG contains a wide range of public data, such as the materials from the commissions and information about the members' interventions and votes. In addition, the KG has been enriched with online user-generated content including posts from social networks related to the constitutional process, and transcriptions from the YouTube videos of the plenary sessions. Among other features, TelarKG leverages the semantic similarity search capabilities of the MillenniumDB endpoint to compute text similarity among convention members' Twitter messages. Additionally, we employ Entity Linking techniques to identify references to members of the Convention and Parties within these messages. TelarKG constitutes one of the most comprehensive historical archives on a political event, enabling users to query and navigate through diverse aspects of Chile's constitutional process.