Minimalist Fitted Bayesian Classifier-based on Likelihood Estimations and Bag-Of-Words -- Inventory and Content Separation in Grammatical Descriptions of Languages of the World An Empirical Study of Span Modeling in Science NER -- Terminology/keyphrase extraction tools for creation of book indexes in Polish -- Token-level Multilingual Epidemic Dataset for Event Extraction -- A Semantic Search Engine for Historical Handwritten Document Image -- Temporal Analysis of Worldwide War -- Data Repositories and Archives -- Where Did the Web Archive Go? -- What's Data Got To Do With It? An Agenda for a New Generation of Digital Libraries -- Semantic Tagging via Entity-level Analytics: Assessment of Concise Content Tagging -- Automating the Selection of Emulated Rendering Environments for Born-Digital Data-Sets -- Colabo.Space - Participatory Platform for Evolving Research and Publishing Workflows -- Evolving Research and Publishing Work -- How can an Archive be Characterized? -- Visualizing Copyright-protected Video Archive Content Through Similarity Search -- Self-Assessment and Monitoring of CHI Performance in Digital Transformation -- Automatic translation and multilingual cultural heritage retrieval: a case study with transcriptions in European -- Linked Data and Open Data -- Leveraging a Federation of Knowledge Graphs to Improve Faceted Search in Digital Libraries -- AnnoTag: Concise Content Annotation via LOD Tags derived from Entity-level Analytics -- User Interfaces and Experience -- ComparingMethods for Finding Search Sessions on a Specified Topic: A Double Case Study -- Clustering and Classifying Users from the National Museums Liverpool Website -- Humanities Scholars and Digital Humanities Projects: Practice Barriers in Tools Usage -- Researching Pandemics Through Time: a Covid-19 Inspired Data-driven Approach to Explore Historical Newspapers.

This book constitutes the proceedings of the 25th International Conference on Theory and Practice of Digital Libraries, TPDL 2021, held in September 2021. Due to COVID-10 pandemic the conference was held virtually. The 10 full papers, 3 short papers and 13 other papers presented were carefully reviewed and selected from 53 submissions. TPDL 2021 attempts to facilitate establishing connections and convergences between diverse research communities such as Digital Humanities, Information Sciences and others that could benefit from ecosystems offered by digital libraries and repositories. This edition of TPDL was held under the general theme of "Linking Theory and Practice". The papers are organized in topical sections as follows: Document and Text Analysis; Data Repositories and Archives; Linked Data and Open Data; User Interfaces and Experience.