--- license: cc-by-4.0 language: - en tags: - legal --- # EUR-LEX Miner 🇪🇺 A high-performance mining tool on GitHub (https://github.com/do-me/eur-lex) for extracting text and semantic concepts from the European Commission's Cellar database. Originally based on [EuropeanParliament/Eurovoc_2025](https://huggingface.co/datasets/EuropeanParliament/Eurovoc_2025) and [EuropeanParliament/Eurovoc](https://huggingface.co/datasets/EuropeanParliament/Eurovoc) but improved and extended for various reasons: - [line breaks are not included](https://huggingface.co/datasets/EuropeanParliament/Eurovoc/discussions/5) that are quite important for semantic chunking approaches and RAG - the preprocessing was way too aggressive and removed too much information - [these repos were abandoned in the past](https://huggingface.co/datasets/EuropeanParliament/Eurovoc/discussions/6) - Updates are infrequent - Most of the metadata was not included This repo improves on all of these points and provides a convenient github action syncing with Huggingface for weekly updates. ## Features - **Fast SPARQL Retrieval**: Custom J2-templated queries for efficient metadata fetching. - **Parallel Parsing**: Multi-threaded extraction from PDF, DOCX, and HTML. - **Vectorized Preprocessing**: Ultra-fast text cleaning powered by `Polars`. - **Modular Design**: Clean separation of concerns following modern Python package standards. - **Robust Caching**: Joblib-powered caching to avoid redundant downloads and expensive parsing. - **Batch Discovery**: Tweak network efficiency with the `--days-per-request` flag to fetch metadata for multiple days in one SPARQL call. - **Rich Metadata Collection**: Automatically extracts: - CELEX numbers for legal uniquely indexing. - Institution/Author labels (e.g., "European Commission"). - Procedure IDs for legislative tracking. - Document types and Eurovoc concept IDs. ## Full-Text Search You can use the script in this GitHub repo to run full-text search in roughly 10-20s on consumer hardware after downloading the whole 6.7Gb dump with 328k rows: https://github.com/do-me/copernicus-climate-eur-lex-viz For instance you can analyze the growth of Copernicus- and climate-related records in the past years: ![image](https://cdn-uploads.huggingface.co/production/uploads/64c4da8719565937fb268b32/XZmZoUOD0LheDXhfr0w-Q.png) ## Installation Ensure you have `uv` installed, then: ```bash git clone cd Eurovoc_2025 uv sync ``` ## Usage Run the miner using the CLI entry point: ```bash # General usage for all languages uv run eur_lex_miner dataset_ --days 10 # Specific language filtering uv run eur_lex_miner dataset_ --days 5 --lang ENG # Keyword Matching # Add boolean columns for specific terms (case-insensitive) uv run eur_lex_miner dataset_ --days 5 --lang ENG --keywords "earth observation" copernicus # Batch Discovery # Fetch 60 days of metadata in a single SPARQL request (faster for large spans) uv run eur_lex_miner dataset_history --days 60 --days-per-request 60 # Data Engineering Best Practices # Use --lookback for a safety margin and --unique-on to deduplicate by ID uv run eur_lex_miner dataset_ --lookback 14 --unique-on celex --lang ENG ``` Large batches might give you a slight performance boost, but probably irrelevant for most use cases. Comparison:

Past 30 days, 30 requests (40.079s) vs 1 request (38.349s)

```zsh (base) ➜ Eurovoc_2025 git:(main) time uv run eur_lex_miner dataset_history --days 30 --days-per-request 30 --lang ENG 2026-01-28 12:38:37,533 - eurovoc_miner.core - INFO - Processing 333 documents for 2025-12-30 to 2026-01-28 2025-12-30 to 2026-01-28: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 333/333 [00:12<00:00, 26.51it/s] 2026-01-28 12:38:50,320 - eurovoc_miner.cli - INFO - ✓ Saved 303 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_history2025-12-30_to_2026-01-28_eng.parquet uv run eur_lex_miner dataset_history --days 30 --days-per-request 30 --lang 40.44s user 1.68s system 109% cpu 38.349 total (base) ➜ Eurovoc_2025 git:(main) time uv run eur_lex_miner dataset_ --days 30 --days-per-request 1 --lang ENG 2026-01-28 12:39:35,265 - eurovoc_miner.core - INFO - Processing 1 documents for 2026-01-28 2026-01-28: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 1/1 [00:00<00:00, 6.20it/s] 2026-01-28 12:39:35,463 - eurovoc_miner.cli - INFO - ✓ Saved 1 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-28_eng.parquet 2026-01-28 12:39:36,307 - eurovoc_miner.core - INFO - Processing 7 documents for 2026-01-27 2026-01-27: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 7/7 [00:00<00:00, 37.39it/s] 2026-01-28 12:39:36,562 - eurovoc_miner.cli - INFO - ✓ Saved 7 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-27_eng.parquet 2026-01-28 12:39:38,917 - eurovoc_miner.core - INFO - Processing 33 documents for 2026-01-26 2026-01-26: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 33/33 [00:00<00:00, 145.75it/s] 2026-01-28 12:39:39,305 - eurovoc_miner.cli - INFO - ✓ Saved 33 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-26_eng.parquet 2026-01-28 12:39:39,699 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-25, creating empty file. 2026-01-28 12:39:39,700 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-25_eng.parquet 2026-01-28 12:39:40,177 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-24, creating empty file. 2026-01-28 12:39:40,180 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-24_eng.parquet 2026-01-28 12:39:42,279 - eurovoc_miner.core - INFO - Processing 28 documents for 2026-01-23 2026-01-23: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 28/28 [00:00<00:00, 118.97it/s] 2026-01-28 12:39:42,664 - eurovoc_miner.cli - INFO - ✓ Saved 23 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-23_eng.parquet 2026-01-28 12:39:44,256 - eurovoc_miner.core - INFO - Processing 18 documents for 2026-01-22 2026-01-22: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 18/18 [00:00<00:00, 75.58it/s] 2026-01-28 12:39:44,647 - eurovoc_miner.cli - INFO - ✓ Saved 15 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-22_eng.parquet 2026-01-28 12:39:47,137 - eurovoc_miner.core - INFO - Processing 36 documents for 2026-01-21 2026-01-21: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 36/36 [00:00<00:00, 153.10it/s] 2026-01-28 12:39:47,522 - eurovoc_miner.cli - INFO - ✓ Saved 33 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-21_eng.parquet 2026-01-28 12:39:49,706 - eurovoc_miner.core - INFO - Processing 31 documents for 2026-01-20 2026-01-20: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 31/31 [00:00<00:00, 135.42it/s] 2026-01-28 12:39:50,112 - eurovoc_miner.cli - INFO - ✓ Saved 29 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-20_eng.parquet 2026-01-28 12:39:51,489 - eurovoc_miner.core - INFO - Processing 16 documents for 2026-01-19 2026-01-19: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 16/16 [00:00<00:00, 71.30it/s] 2026-01-28 12:39:51,866 - eurovoc_miner.cli - INFO - ✓ Saved 15 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-19_eng.parquet 2026-01-28 12:39:52,360 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-18, creating empty file. 2026-01-28 12:39:52,361 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-18_eng.parquet 2026-01-28 12:39:52,878 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-17, creating empty file. 2026-01-28 12:39:52,879 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-17_eng.parquet 2026-01-28 12:39:54,190 - eurovoc_miner.core - INFO - Processing 15 documents for 2026-01-16 2026-01-16: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 15/15 [00:00<00:00, 69.88it/s] 2026-01-28 12:39:54,552 - eurovoc_miner.cli - INFO - ✓ Saved 13 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-16_eng.parquet 2026-01-28 12:39:56,940 - eurovoc_miner.core - INFO - Processing 33 documents for 2026-01-15 2026-01-15: 100%|████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 33/33 [00:00<00:00, 135.13it/s] 2026-01-28 12:39:57,350 - eurovoc_miner.cli - INFO - ✓ Saved 29 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-15_eng.parquet 2026-01-28 12:39:59,039 - eurovoc_miner.core - INFO - Processing 21 documents for 2026-01-14 2026-01-14: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 21/21 [00:00<00:00, 94.03it/s] 2026-01-28 12:39:59,419 - eurovoc_miner.cli - INFO - ✓ Saved 18 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-14_eng.parquet 2026-01-28 12:40:00,748 - eurovoc_miner.core - INFO - Processing 15 documents for 2026-01-13 2026-01-13: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 15/15 [00:00<00:00, 69.36it/s] 2026-01-28 12:40:01,142 - eurovoc_miner.cli - INFO - ✓ Saved 14 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-13_eng.parquet 2026-01-28 12:40:03,223 - eurovoc_miner.core - INFO - Processing 24 documents for 2026-01-12 2026-01-12: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 24/24 [00:00<00:00, 76.47it/s] 2026-01-28 12:40:03,763 - eurovoc_miner.cli - INFO - ✓ Saved 23 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-12_eng.parquet 2026-01-28 12:40:04,431 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-11, creating empty file. 2026-01-28 12:40:04,432 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-11_eng.parquet 2026-01-28 12:40:04,957 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-10, creating empty file. 2026-01-28 12:40:04,958 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-10_eng.parquet 2026-01-28 12:40:06,618 - eurovoc_miner.core - INFO - Processing 17 documents for 2026-01-09 2026-01-09: 100%|█████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 17/17 [00:00<00:00, 71.38it/s] 2026-01-28 12:40:07,024 - eurovoc_miner.cli - INFO - ✓ Saved 15 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-09_eng.parquet 2026-01-28 12:40:07,785 - eurovoc_miner.core - INFO - Processing 7 documents for 2026-01-08 2026-01-08: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 7/7 [00:00<00:00, 39.67it/s] 2026-01-28 12:40:08,036 - eurovoc_miner.cli - INFO - ✓ Saved 7 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-08_eng.parquet 2026-01-28 12:40:08,620 - eurovoc_miner.core - INFO - Processing 3 documents for 2026-01-07 2026-01-07: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 3/3 [00:00<00:00, 17.43it/s] 2026-01-28 12:40:08,852 - eurovoc_miner.cli - INFO - ✓ Saved 2 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-07_eng.parquet 2026-01-28 12:40:09,884 - eurovoc_miner.core - INFO - Processing 9 documents for 2026-01-06 2026-01-06: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 9/9 [00:00<00:00, 50.34it/s] 2026-01-28 12:40:10,164 - eurovoc_miner.cli - INFO - ✓ Saved 8 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-06_eng.parquet 2026-01-28 12:40:10,903 - eurovoc_miner.core - INFO - Processing 7 documents for 2026-01-05 2026-01-05: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 7/7 [00:00<00:00, 39.85it/s] 2026-01-28 12:40:11,156 - eurovoc_miner.cli - INFO - ✓ Saved 6 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-05_eng.parquet 2026-01-28 12:40:11,584 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-04, creating empty file. 2026-01-28 12:40:11,585 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-04_eng.parquet 2026-01-28 12:40:11,911 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-03, creating empty file. 2026-01-28 12:40:11,912 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-03_eng.parquet 2026-01-28 12:40:12,313 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-02, creating empty file. 2026-01-28 12:40:12,314 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-02_eng.parquet 2026-01-28 12:40:12,784 - eurovoc_miner.cli - INFO - ∅ No documents for 2026-01-01, creating empty file. 2026-01-28 12:40:12,786 - eurovoc_miner.cli - INFO - ✓ Saved empty file to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2026-01-01_eng.parquet 2026-01-28 12:40:13,390 - eurovoc_miner.core - INFO - Processing 5 documents for 2025-12-31 2025-12-31: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 5/5 [00:00<00:00, 28.90it/s] 2026-01-28 12:40:13,631 - eurovoc_miner.cli - INFO - ✓ Saved 5 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2025-12-31_eng.parquet 2026-01-28 12:40:14,318 - eurovoc_miner.core - INFO - Processing 7 documents for 2025-12-30 2025-12-30: 100%|███████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████| 7/7 [00:00<00:00, 40.57it/s] 2026-01-28 12:40:14,568 - eurovoc_miner.cli - INFO - ✓ Saved 7 records to /Users/dome/work/jrc/Eurovoc_2025/files/dataset_2025-12-30_eng.parquet uv run eur_lex_miner dataset_ --days 30 --days-per-request 1 --lang ENG 56.75s user 15.49s system 180% cpu 40.079 total ```

### Keyword Matching Logic When using the `--keywords` flag: - **Compound Terms**: Wrap terms with spaces in quotes (e.g., `"earth observation"`). - **Auto-Sanitization**: Keywords are converted to clean snake_case column names (e.g., `match_earth_observation`). - **Performance**: Matching is performed using vectorized Polars operations. - **Consistency**: Empty daily files still contain the keyword columns to maintain schema across all Parquet files. - **Filtering**: Use `--save-only-keyword-matches` to only save records that match at least one of the provided keywords. The output will be saved as daily `.parquet` files in the `files/` directory. ## Project Structure - `src/eurovoc_miner/`: Core logic and CLI. - `files/`: Output data storage. - `cache/`: Internal joblib cache (ignored by git). - `tests/`: Unit and integration tests. (to do) ## Development To add new parsers, refer to `src/eurovoc_miner/parsers.py`. To modify the SPARQL logic, see `src/eurovoc_miner/fetcher.py`.