{
  "abstract": "The Ontologies4Chem workshop series brings together developers and users of chemical ontologies to align ontology initiatives with shared standards and approaches to semantic interoperability. The 4th Ontologies4Chem Workshop, organized by TIB in collaboration with the Beilstein-Institute, the NFDI4Chem Consortium, the NFDI4Cat Consortium, and the Physical Sciences Data Infrastructure (PSDI) took place from November 11 to 13, 2025 in Limburg an der Lahn (Hessen, Germany). The programme covered chemical ontologies and their applications on the first day, the ontological representation of chemical reactions and experimental workflows on the second, and the reuse and further development of ChEBI as the central resource for chemical entities on the third. Talks on RO-Crate, DCAT-AP+, and chemDCAT-AP added the provenance and packaging layer that complements ontologies in FAIR data workflows. A central outcome of the workshop is the introduction of the Ontologies4Chem Canon, a vision of a living, community-curated body of the essential ontologies for chemistry together with their design patterns and the discourse around them. It rests on modular, OBO-aligned design, reuse before creation, the IUPAC Gold Book as source of definitions, and ODK-based development and deployment pipelines, provided by the NFDI4Chem Terminology Service and related internally through SSSOM mappings. The hacking sessions initiated the migration of the CHEMINF ontology to an ODK-based infrastructure and led to a decision, taken together with the ChEBI team, to reincorporate disjointness axioms into the ChEBI release cycle. Presentations on ontology pre-training, ChemLog, and Chebifier 2 showed how ontologies and machine learning reinforce each other. A panel discussion with the ChEBI team identified sustainable, community-driven governance and funding as the decisive challenges for the field.",
  "abstract_shown": true,
  "affiliations": [
    "TIB - Leibniz Information Centre for Science and Technology",
    "University of Southampton",
    "TU Dortmund University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 8,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Oliver Koepler",
      "orcid": "0000-0003-3385-4232"
    },
    {
      "affs": [
        0
      ],
      "name": "Philip Strömert",
      "orcid": "0000-0002-1595-3213"
    },
    {
      "affs": [
        0
      ],
      "name": "Johannes Hunold",
      "orcid": "0000-0002-4378-6061"
    },
    {
      "name": "Sabrina Krohm",
      "orcid": "0009-0006-7384-808X"
    },
    {
      "affs": [
        0
      ],
      "name": "Noura Rayya",
      "orcid": "0009-0001-5998-5030"
    },
    {
      "affs": [
        1
      ],
      "name": "Samantha Pearman-Kanza",
      "orcid": "0000-0002-4831-9489"
    },
    {
      "affs": [
        2
      ],
      "name": "Hendrik Borgelt",
      "orcid": "0000-0001-5886-7860"
    },
    {
      "affs": [
        2
      ],
      "name": "Norbert Kockmann",
      "orcid": "0000-0002-8852-3812"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/5pfy6tzesqhtc.bib",
  "cited_by": 0,
  "doi": "10.26434/chemrxiv.15009189/v1",
  "fulltext_url": null,
  "id": "5pfy6tzesqhtc",
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  "landing_url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009189/v1",
  "language": null,
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "1702|Semantic Web and Ontologies"
    ]
  ],
  "openalex": "W7213939799",
  "pdf_url": "https://chemrxiv.org/doi/pdf/10.26434/chemrxiv.15009189/v1",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-21",
  "publisher": "American Chemical Society (ACS)",
  "ris": "https://research.draconitic.com/paper/5pfy6tzesqhtc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:21Z",
      "native_id": "10.26434/chemrxiv.15009189",
      "source": "chemrxiv",
      "url": "https://chemrxiv.org/doi/full/10.26434/chemrxiv.15009189/v1"
    }
  ],
  "subjects": [
    {
      "field": "chemistry",
      "origin": "source:chemrxiv",
      "subfield": "general"
    }
  ],
  "title": "Report – 4th Ontologies4Chem Workshop",
  "title_text": "Report – 4th Ontologies4Chem Workshop",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:21Z",
  "url": "https://research.draconitic.com/paper/5pfy6tzesqhtc",
  "venue": "ChemRxiv",
  "versions": []
}