This two-volume set LNCS 16549 + 16550 constitutes the refereed proceedings of the 23rd European Semantic Web Conference, ESWC 2026, held in Dubrovnik, Croatia, during May 2026.

The papers presented were carefully reviewed and selected for inclusion in the book. For the research track 28 papers have been accepted from 116 submissions; the resources track received 63 submissions of which 17 have been accepted; and for the In-use track 10 papers are included from 27 submitted.

The ESWC's Research track addresses the theoretical, analytical, and empirical aspects of the semantic web, semantic technologies, knowledge graphs and semantics on the Web in general. The In-use track focuses on contributions that reuse and apply state-of-the-art semantic technologies or resources to real-world settings. The resource track deals with resource contributions that are, on the one hand innovative or novel, and on the other hand sharable and reusable (e.g. datasets, knowledge graphs, ontologies, workflows, benchmarks, frameworks), and provide the necessary scaffolding to support the generation of scientific work and advance the state of the art.

Inhalt

Resources.- A Linked Open Data Service and Semantic Portal to Study the Assembly Minutes and Prosopography of the League of Nations (19201946).- OntoPFAS: an Ontology for the Forever Chemicals.- Neuro-Symbolic Stream Reasoning with Kolibrie.- ArtKB: A Multimodal Art Knowledge Base for Cultural Heritage.- Mapping Change: A Temporal and Semantic Knowledge Base of Scottish Gazetteers.- CUBE-MT: A Cultural Benchmark for Multimodal Knowledge Graph Construction with Generative Models.- EthereumKG: Building a Knowledge Graph of the Ethereum Blockchain.- CANDI - A Semantic Framework for CAN bus Data Modeling and System Integration.- CR-TKGQA: A Temporal Knowledge Graph Question Answering Dataset Involving Complex Reasoning.- SemTS: Ontology and Vocabularies for the Semantic Categorization of Time Series Knowledge.- Tool4Boxology: A Semantic Toolbox for Constructing and Analyzing Neuro-Symbolic Architectures.- Bench4KE: Benchmarking Automated Competency Question Generation.- Traqula: Providing a Foundation for The Evolving SPARQL Ecosystem Through Modular Query Parsing, Transformation, and Generation.- SIDEKICK: A semantically integrated resource for drug effects, indications, and contraindications.- HERTy-Wiki: A Benchmark for Hierarchical Entity Reasoning and Typing.- AgentO: An Ontology for Modeling Agentic AI Systems.- BOLD: A Simulation Framework for Dynamic Linked Data Environments and a Benchmark for Linked Data User Agents.- In-Use.- Energy Domain Ontology Matching with Large Language Model.- Context-Aware Visual Multi-Turn Conversation Generation from Wikipedia and Wikidata.- A Wikidata-based Workflow for Entity Reconciliation Strategies Evaluation: A Study on Early Modern Polish Personal Names.- LLM-Enhanced Semantic Data Integration of Electronic Component Qualifications in the Aerospace Domain.- Towards Context-Aware Search: Dynamic Facet Generation in Digital Libraries.- An Ecosystem of Knowledge Graph-based Web Services for Greenhouse Gas Assessment.- VRTI Knowledge Graph Explorer: Adoption, Use and Impact.- A Graph-based RAG system for Enhanced Information Gathering in Local Newsrooms.- Knowledge-Enhanced Multimodal Retrieval over Cultural Heritage Knowledge Graphs.- Towards a Symbolic Representation of the MEMS Development Domain.