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README.md

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+---
+license: cc0-1.0
+language:
+- fr
+- en
+tags:
+- hal
+- science
+- scholarly-metadata
+- oai-pmh
+pretty_name: HAL metadata snapshot
+size_categories:
+- 1M<n<10M
+configs:
+- config_name: default
+  data_files:
+  - split: train
+    path: data/train-*.parquet
+dataset_info:
+  features:
+  - name: id
+    dtype: string
+  - name: version
+    dtype: int16
+  - name: url
+    dtype: string
+  - name: pdf_url
+    dtype: string
+  - name: title
+    dtype: string
+  - name: titles
+    list:
+      - name: lang
+        dtype: string
+      - name: text
+        dtype: string
+  - name: authors
+    sequence: string
+  - name: contributors
+    sequence: string
+  - name: abstract
+    dtype: string
+  - name: abstracts
+    list:
+      - name: lang
+        dtype: string
+      - name: text
+        dtype: string
+  - name: keywords
+    sequence: string
+  - name: domains
+    sequence: string
+  - name: domain_codes
+    sequence: string
+  - name: doc_type
+    dtype: string
+  - name: type_labels
+    sequence: string
+  - name: type_eurepo
+    sequence: string
+  - name: date
+    dtype: string
+  - name: year
+    dtype: int16
+  - name: datestamp
+    dtype: timestamp[s]
+  - name: language
+    dtype: string
+  - name: publisher
+    dtype: string
+  - name: source
+    sequence: string
+  - name: citation
+    dtype: string
+  - name: doi
+    dtype: string
+  - name: arxiv_id
+    dtype: string
+  - name: pmid
+    dtype: string
+  - name: issn
+    sequence: string
+  - name: isbn
+    sequence: string
+  - name: license
+    dtype: string
+  - name: access_rights
+    dtype: string
+  - name: funding
+    sequence: string
+  - name: collections
+    sequence: string
+  - name: oai_identifier
+    dtype: string
+---
+# HAL metadata snapshot
+
+Bibliographic metadata of the records in [HAL](https://hal.science), the French national open
+archive operated by CCSD, harvested through its OAI-PMH interface (`https://api.archives-ouvertes.fr/oai/hal/`,
+`metadataPrefix=oai_dc`).
+
+- Snapshot date: 2026-10-21
+- Records: 4,610,856 (deleted records excluded), in 19 Parquet file(s)
+- One row per HAL document (latest harvested version); `id` is the HAL identifier.
+
+## Columns
+
+Field names refer to Dublin Core elements of the OAI record.
+
+| column | type | source |
+|---|---|---|
+| `id` | string | HAL identifier without version, e.g. `hal-01234567` |
+| `version` | int16 | HAL version number of the harvested record (from the OAI identifier) |
+| `url` | string | HAL landing page (`dc:identifier`, or built from `id`): the link to credit HAL with |
+| `pdf_url` | string | Main file URL when HAL exposes one |
+| `title` | string | First `title` |
+| `titles` | list of struct | All titles with their `xml:lang` |
+| `authors` | list[string] | `creator`, in record order |
+| `contributors` | list[string] | `contributor` |
+| `abstract` | string | English abstract if present, otherwise the first one (`description`/`abstract`) |
+| `abstracts` | list of struct | All abstracts with their `xml:lang` |
+| `keywords` | list[string] | `subject` values that are not HAL discipline labels |
+| `domains` | list[string] | HAL discipline labels from `subject` (e.g. `[INFO.INFO-LG] Computer Science [cs]/...`) |
+| `domain_codes` | list[string] | Discipline codes from the OAI `subject:*` sets |
+| `doc_type` | string | HAL document-type code from the OAI `type:*` sets (ART, COMM, THESE, ...) |
+| `type_labels` | list[string] | `type` values that are not info:eu-repo URIs (e.g. Journal articles) |
+| `type_eurepo` | list[string] | info:eu-repo/semantics type and version URIs from `type` |
+| `date` | string | `date` / `issued` as stored |
+| `year` | int16 | Year of `date` |
+| `datestamp` | timestamp | OAI-PMH datestamp: last modification of the record |
+| `language` | string | `language` |
+| `publisher` | string | `publisher` |
+| `source` | list[string] | `source` (journal / conference / book the work appeared in) |
+| `citation` | string | Bibliographic citation found in `identifier` / `bibliographicCitation` |
+| `doi` | string | DOI (normalized) found in identifiers / relations |
+| `arxiv_id` | string | arXiv id from `relation` (info:eu-repo/semantics/altIdentifier/arxiv/...) |
+| `pmid` | string | PubMed id from `relation` |
+| `issn` | list[string] | ISSNs found in `source` / `identifier` |
+| `isbn` | list[string] | ISBNs found in `source` / `identifier` |
+| `license` | string | Licence URL from `rights` |
+| `access_rights` | string | info:eu-repo access level from `rights` (openAccess, embargoedAccess, ...) |
+| `funding` | list[string] | info:eu-repo/grantAgreement relations |
+| `collections` | list[string] | HAL collections from the OAI `collection:*` sets |
+| `oai_identifier` | string | OAI identifier of the harvested record |
+
+## Notes
+
+- Values come from HAL as-is; author names, languages and dates are not normalized.
+- `domain_codes`, `doc_type` and `collections` come from the OAI set memberships of each record.
+
+## Licence
+
+HAL distributes the metadata of all its deposits under [CC0 1.0](https://creativecommons.org/publicdomain/zero/1.0/)
+([HAL documentation](https://doc.hal.science/en/aspects-juridiques/conditions-de-reutilisation/)),
+and this dataset is released under the same terms. HAL asks reusers to mention the source with a
+link to each record (e.g. `https://hal.science/hal-00000001`); every row carries it in `url`.
+Please keep that link and cite HAL (CCSD) as the source.
+
+This dataset contains metadata only. Files deposited in HAL have their own licences (Creative
+Commons, Licence Ouverte or copyright, chosen by the authors) and are not part of this dataset.
+
+## Personal data
+
+Records contain the names of authors and contributors as published in HAL. CC0 waives copyright,
+not data-protection rights: if you are an author and want a record removed from this copy, open a
+discussion on this dataset. Records withdrawn from HAL are removed when the dataset is refreshed.

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