Update from Crossref snapshot 2026-07 (artifact bb023ebb89ae2e7735d94645d6d42a777ebf0a1a5ae346b6ca7520f9b803137e)

README.md

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+---
+license: cc0-1.0
+task_categories:
+  - feature-extraction
+language:
+  - en
+tags:
+  - datacite
+  - crossref
+  - citations
+  - scholarly-communications
+  - bibliometrics
+  - doi
+  - landing-pages
+pretty_name: Crossref DataCite Citations
+size_categories:
+  - 1M<n<10M
+configs:
+  - config_name: all
+    data_files:
+      - split: train
+        path: data/all/*.parquet
+    default: true
+  - config_name: asserted
+    data_files:
+      - split: train
+        path: data/asserted/*.parquet
+  - config_name: mined
+    data_files:
+      - split: train
+        path: data/mined/*.parquet
+  - config_name: ambiguous_urls
+    data_files:
+      - split: train
+        path: data/ambiguous_urls/*.parquet
+---
+
+# Crossref DataCite Citations
+
+A dataset of DataCite-registered works and the Crossref-registered works that
+cite them, extracted from Crossref reference metadata and confirmed against
+the DataCite monthly data file.
+
+## Dataset Description
+
+Each record in the citation configurations is one DataCite DOI together with
+every confirmed citing work found in Crossref reference metadata. A reference
+is confirmed when it carries a DOI registered in DataCite, an arXiv
+identifier whose arXiv DOI is registered in DataCite, or a landing-page URL
+that is the registered URL of exactly one DataCite record.
+
+Built from the Crossref Metadata Plus monthly snapshot `2026-07` and the
+DataCite monthly data file `2026-07` with
+[crossref-citation-extraction](https://github.com/cometadata/crossref-arxiv-citation-extraction)
+version 2.2.0.
+
+### Provenance and Ambiguity Policy
+
+- `publisher` and `crossref` matches come from references whose DOI was
+  asserted by the publisher or matched by Crossref. `mined` matches were
+  extracted from unstructured reference text: DOIs, arXiv identifiers, and
+  landing-page URLs.
+- A landing-page URL registered by more than one DataCite record never
+  produces a citation. Such references are published separately in the
+  `ambiguous_urls` configuration with every candidate DOI and are excluded
+  from every citation count.
+- Counts are recomputed per configuration: a citing work appears in a
+  configuration only with its matches of that configuration's provenances.
+
+### Dataset Configurations
+
+| Config | Description | Cited Works | Citing Works | Reference Matches |
+|--------|-------------|-------------|--------------|-------------------|
+| `all` | All confirmed citations (default) | 1,715,770 | 7,426,049 | 7,515,087 |
+| `asserted` | Citations whose DOI was asserted by the publisher or matched by Crossref | 582,302 | 1,269,805 | 1,277,754 |
+| `mined` | Citations extracted from unstructured reference text | 1,325,905 | 6,157,532 | 6,237,333 |
+
+The `ambiguous_urls` configuration holds 47,808 unresolved
+URL references. It is evidence for downstream resolution, not citations, and
+it is excluded from the counts above.
+
+### Build Identity
+
+| Field | Value |
+|-------|-------|
+| Crossref snapshot | `2026-07` |
+| DataCite release | `2026-07` |
+| Run identity fingerprint | `6ef72a4272487c1b91c8481aec59b37bef7fc5b862c9f6194f3415d2a2a26d42` |
+| Extractor version | `2.2.0` |
+| Artifact manifest | `metadata/pipeline-manifest.json` |
+
+The manifest lists every published file with its size and SHA-256 digest; the
+SHA-256 of the manifest bytes identifies this publication.
+
+### Loading the Dataset
+
+```python
+from datasets import load_dataset
+
+dataset = load_dataset("cometadata/crossref-datacite-citations")
+asserted = load_dataset("cometadata/crossref-datacite-citations", "asserted")
+mined = load_dataset("cometadata/crossref-datacite-citations", "mined")
+ambiguous = load_dataset("cometadata/crossref-datacite-citations", "ambiguous_urls")
+```
+
+## Data Schema
+
+### Citation Configurations (`all`, `asserted`, `mined`)
+
+Each record contains:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `doi` | string | Canonical lowercase DataCite DOI of the cited work |
+| `citation_count` | integer | Number of distinct citing works in this configuration |
+| `cited_by` | array | List of citing work objects |
+| `reference_count` | integer | Number of confirmed reference tuples |
+
+Each citing work object in `cited_by` contains:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `doi` | string | DOI of the citing work |
+| `provenance` | string | Strongest provenance among this work's matches (`publisher` > `crossref` > `mined`) |
+| `matches` | array | Reference matches from this citing work, in reference order |
+
+Each match contains:
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `provenance` | string | How this match was obtained (see below) |
+| `match_type` | string | What was matched: `doi`, `arxiv`, `url` |
+| `raw_match` | string | The exact substring that matched |
+| `reference` | struct | The Crossref reference metadata (string-valued fields; absent keys are null) |
+
+### `ambiguous_urls`
+
+| Field | Type | Description |
+|-------|------|-------------|
+| `citing_doi` | string | DOI of the citing work |
+| `ref_index` | integer | Position of the reference in the citing work's reference list |
+| `url` | string | Normalized landing-page URL that matched several DataCite records |
+| `raw_match` | string | The exact substring that matched |
+| `candidate_dois` | array | Every DataCite DOI registered with this landing-page URL |
+| `reference` | struct | The Crossref reference metadata (string-valued fields; absent keys are null) |
+
+### Provenance Values
+
+- `publisher` - the reference carries an explicit DataCite DOI with `doi-asserted-by: publisher`
+- `crossref` - the reference carries an explicit DataCite DOI with `doi-asserted-by: crossref`
+- `mined` - the identifier was extracted from unstructured reference text
+
+The `asserted` config contains only `publisher` and `crossref` matches; the
+`mined` config contains only `mined` matches.
+
+## Extraction Process
+
+References in the Crossref snapshot are scanned for DOIs, arXiv identifiers,
+and landing-page URLs. Each candidate is normalized and looked up in an index
+built from the DataCite monthly data file `2026-07`: DOIs must be
+registered in DataCite, arXiv identifiers must map to a registered arXiv DOI,
+and URLs must equal the registered landing page of exactly one record. URLs
+registered by several records are recorded as ambiguous evidence instead.
+
+## Data Sources
+
+- Crossref Metadata Plus monthly snapshot `2026-07`
+- DataCite monthly data file `2026-07`
+- Extraction tools: [cometadata/crossref-arxiv-citation-extraction](https://github.com/cometadata/crossref-arxiv-citation-extraction)
+
+## Limitations
+
+- Only citations registered in Crossref reference metadata are included.
+- Only DOIs and landing-page URLs registered in DataCite are matched; works
+  registered with other agencies are not represented.
+- Landing-page matching uses the URLs registered in the DataCite release
+  `2026-07`; earlier or historical URLs of a record are not
+  matched.
+- The dataset reflects one Crossref snapshot and one DataCite release; each
+  publication replaces the previous contents rather than accumulating them.
+- References whose URL is registered by several DataCite records appear only
+  in `ambiguous_urls` and are never counted as citations.
+- Reference parsing depends on successful identifier extraction from
+  unstructured references; the `mined` subset may contain lower-quality
+  matches from noisy reference text.
+
+## License
+
+This dataset is released under
+[CC0 1.0 Universal](https://creativecommons.org/publicdomain/zero/1.0/).
+
+## Citation
+
+```bibtex
+@dataset{crossref_datacite_citations,
+  title = {Crossref DataCite Citations},
+  author = {Cometadata},
+  publisher = {Hugging Face},
+  url = {https://huggingface.co/datasets/cometadata/crossref-datacite-citations}
+}
+```

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