overthelex/ua-court-citation-graph

Ukrainian Court Citation Graph (ЄДРСР)

A large-scale co-citation graph derived from 99.5 million Ukrainian court decisions in the Unified State Register of Court Decisions (ЄДРСР / EDRSR).

Overview

This dataset contains the co-citation network of Ukrainian legislation as cited in court decisions from 2003 to 2026. Two legal provisions (articles) are linked if they are cited together in the same court decision. The edge weight reflects how many decisions co-cite the pair.

Source corpus: 99.5M full-text court decisions from reyestr.court.gov.ua Citation extraction: 345M citation rows extracted via regex patterns matching Ukrainian legal citation conventions (codex articles, law articles, constitutional provisions, case references) Co-citation construction: Streaming pairwise combination of articles per decision, filtered to edges with weight >= 10

Dataset Statistics

Metric	Value
Source decisions	99,500,000
Extracted citations	345,000,000
Unique article-decision pairs	36,958,613
Co-citation edges (weight >= 10)	2,328,213
Unique articles in graph	~50,000
Time span	2003 -- 2026

Files

cocitation_edges.parquet (9.4 MB)

The core co-citation graph. Each row is an undirected edge between two legal provisions.

Column	Type	Description
law_a	string	Name of the first law/codex
article_a	string	Article number in the first law
law_b	string	Name of the second law/codex
article_b	string	Article number in the second law
weight	int64	Number of court decisions co-citing both articles

article_citation_stats.parquet (0.2 MB)

Top 50,000 most-cited legal provisions with citation counts.

Column	Type	Description
law_number	string	Law or codex name
law_article	string	Article number
citation_type	string	Type: codex_article, law_article, constitution
total_citations	int64	Total citation count across all decisions
unique_decisions	int64	Number of unique decisions citing this article

article_centrality.parquet

Graph centrality measures for top articles (union of top-50 by degree, PageRank, and HITS authority).

Column	Type	Description
law_number	string	Law or codex name
law_article	string	Article number
degree	int64	Weighted degree in co-citation graph
pagerank	float64	PageRank score
authority	float64	HITS authority score

community_labels.parquet

Louvain community detection results across 5 time periods (2007--2010, 2011--2014, 2015--2018, 2019--2022, 2023--2026).

Column	Type	Description
period	string	Time period
community_rank	int32	Rank by size within period
community_size	int32	Number of articles in community
dominant_law	string	Most frequent law in the community
dominant_law_fraction	float64	Fraction of articles from dominant law
total_citations	int64	Sum of citations across community members

Key Findings

• Power-law degree distribution with exponent alpha = 2.17 (scale-free network)
• PageRank diverges from raw degree: ст. 10 ЦПК (fair trial) ranks #1 by PageRank but #2 by degree, indicating structural centrality beyond citation frequency
• Community structure tracks legal domains: Louvain modularity 0.54--0.61, with communities aligning to criminal, civil, administrative, and tax law
• Temporal stability: NMI between adjacent periods > 0.85, but post-2017 judicial reform shows community reorganization
• Citation prediction: Logistic regression on graph features achieves AUC = 0.9984 for predicting top-1000 articles in 2020--2026 from 2007--2019 features

Paper

This dataset is introduced in:

Automatic Construction of a Legal Citation Graph from 100 Million Ukrainian Court Decisions: Large-Scale Extraction, Topological Analysis, and Ontology-Driven Clustering Volodymyr Ovcharov (2026). arXiv:2605.15362 [cs.CL]

Citation

@article{ovcharov2026citationgraph,
  title={Automatic Construction of a Legal Citation Graph from 100 Million Ukrainian Court Decisions: Large-Scale Extraction, Topological Analysis, and Ontology-Driven Clustering},
  author={Ovcharov, Volodymyr},
  journal={arXiv preprint arXiv:2605.15362},
  year={2026},
  url={https://arxiv.org/abs/2605.15362}
}

Related

• overthelex/ua-case-outcome -- Ukrainian court case outcome prediction dataset
• overthelex/oversight-constitution -- Edit-trace oversight constitution dataset
• Paper: Automatic Construction of a Legal Citation Graph from 100 Million Ukrainian Court Decisions (arXiv:2605.15362)

License

CC-BY-NC-SA-4.0. Academic and research use is free. Commercial use requires separate licensing from legal.org.ua.