docs: add initial version

README.md

@@ -0,0 +1,601 @@
+---
+license:
+  - other
+license_details: >-
+  Mixed. Every document carries its own license in the `license` and
+  `license_family` columns (CC BY-SA 4.0/3.0/2.0, CC BY-NC 3.0, CC0 1.0,
+  CC BY 4.0/3.0, CC BY-NC-SA 4.0, Project Gutenberg license, and a few
+  library-specific rights statements). Filter by `license_family` before
+  reuse.
+language:
+  - de
+  - la
+  - gml
+language_details: deu, lat, gml (Middle Low German); Early New High German and New High German texts, tagged as deu
+multilinguality:
+  - monolingual
+size_categories:
+  - 1K<n<10K
+pretty_name: Deutsches Textarchiv (DTA) Documents
+source_datasets:
+  - original
+annotations_creators:
+  - expert-generated
+language_creators:
+  - found
+tags:
+  - historical
+  - historical-german
+  - early-new-high-german
+  - german
+  - dta
+  - deutsches-textarchiv
+  - tei
+  - tcf
+  - fraktur
+  - ocr
+  - orthographic-normalization
+  - spelling-normalization
+  - cab
+  - digital-humanities
+  - 15th-century
+  - 16th-century
+  - 17th-century
+  - 18th-century
+  - 19th-century
+  - 20th-century
+configs:
+  - config_name: documents
+    default: true
+    data_files:
+      - split: train
+        path: documents/train-*.parquet
+dataset_info:
+  config_name: documents
+  features:
+    - name: id
+      dtype: string
+    - name: dta_id
+      dtype: string
+    - name: urn
+      dtype: string
+    - name: url
+      dtype: string
+    - name: title
+      dtype: string
+    - name: subtitle
+      dtype: string
+    - name: volume
+      dtype: string
+    - name: part
+      dtype: string
+    - name: authors
+      list:
+        - name: surname
+          dtype: string
+        - name: forename
+          dtype: string
+        - name: gnd
+          dtype: string
+    - name: date_published
+      dtype: string
+    - name: year
+      dtype: int64
+    - name: place_of_publication
+      dtype: string
+    - name: publisher
+      dtype: string
+    - name: edition
+      dtype: string
+    - name: num_pages
+      dtype: int64
+    - name: repository
+      dtype: string
+    - name: shelfmark
+      dtype: string
+    - name: typeface
+      dtype: string
+    - name: bibl
+      dtype: string
+    - name: genre_dtamain
+      dtype: string
+    - name: genre_dtasub
+      dtype: string
+    - name: genre_dwds1main
+      dtype: string
+    - name: genre_dwds1sub
+      dtype: string
+    - name: dta_corpus_labels
+      list: string
+    - name: language
+      dtype: string
+    - name: language_note
+      dtype: string
+    - name: license
+      dtype: string
+    - name: license_family
+      dtype: string
+    - name: num_images
+      dtype: int64
+    - name: num_tokens
+      dtype: int64
+    - name: num_types
+      dtype: int64
+    - name: num_characters
+      dtype: int64
+    - name: num_sentences
+      dtype: int64
+    - name: text
+      dtype: string
+    - name: text_source
+      dtype: string
+    - name: text_normalized
+      dtype: string
+  splits:
+    - name: train
+      num_examples: 5480
+---
+
+# Deutsches Textarchiv (DTA) Documents
+
+This datasets hosts all documents from the Deutsches Textarchiv (DTA).
+
+One row per work of the [Deutsches Textarchiv (DTA)](https://www.deutschestextarchiv.de/), built from the
+official DTA dump `dta_komplett_2026-02-10` (TCF format). The dataset contains **5,480 documents** spanning
+**1472 to 1987** with about **205M tokens** and **1.4B characters** of German text, with two text views per document:
+
+* `text`: the historical, layout-faithful transcription (line breaks, long s `ſ`, combining diacritics, original spelling);
+* `text_normalized`: the same text in modern orthography, produced by applying the DTA CAB orthography corrections
+  (`operation="replace"`) to the token layer.
+
+Rich bibliographic metadata comes directly from the embedded TEI header: authors with GND identifiers, original
+publication date and place, publisher, holding library and shelfmark, typeface, four genre schemes, DTA subcorpus
+labels and the per-work license. Licenses vary across the corpus, so please check the `license_family` column
+before reuse (see [Licensing](#licensing)).
+
+## Dataset structure
+
+### Configs and splits
+
+| Config | Split | Rows | Files |
+|---|---|---:|---|
+| `documents` (default) | `train` | 5,480 | `documents/train-0000[0-5].parquet` (6 shards, zstd-compressed Parquet) |
+
+There is only one split, because the dataset is a corpus and not a benchmark.
+
+### Loading
+
+```python
+from datasets import load_dataset
+
+ds = load_dataset("histde/dta-documents", "documents", split="train")
+print(ds[0]["title"], ds[0]["year"])
+
+# Only permissively licensed works, as a streaming iterator
+permissive = load_dataset("histde/dta-documents", "documents", split="train", streaming=True)
+permissive = permissive.filter(lambda d: d["license_family"] in {"cc0-1.0", "cc-by-4.0", "cc-by-3.0"})
+```
+
+With Polars, straight from the Parquet shards:
+
+```python
+import polars as pl
+
+df = pl.read_parquet("hf://datasets/histde/dta-documents/documents/train-*.parquet")
+df.filter(pl.col("year") < 1700).select("id", "title", "license_family", "num_tokens")
+```
+
+### Schema
+
+| Column | Type | Description | Example |
+|---|---|---|---|
+| `id` | `string` | DTA directory name, used as the primary document identifier (`DTADirName`). Falls back to the TCF file name | `goethe_faust01_1808` |
+| `dta_id` | `string` | Numeric DTA identifier (`DTAID`) | `200006` |
+| `urn` | `string` | Persistent URN of the work | `urn:nbn:de:kobv:b4-200006-1` |
+| `url` | `string` | Landing page of the work at deutschestextarchiv.de | `https://www.deutschestextarchiv.de/343016` |
+| `title` | `string` | Main title(s) from the TEI title statement. Multiple main titles are joined with `\n` | `Iphigenie auf Tauris` |
+| `subtitle` | `string` | Subtitle(s), joined with `\n`. Null if absent | `Ein Schauspiel` |
+| `volume` | `string` | Volume title (text of `<title type="volume">`). Null if absent | `Dritter Theil` |
+| `part` | `string` | Part title (text of `<title type="part">`). Null if absent | `Die sentimentalischen Dichter` |
+| `authors` | `list<struct>` | Authors as `{surname, forename, gnd}` structs. `gnd` is the GND/PND URI, may be null. Empty list for anonymous works | `[{"surname": "Reideburg", "forename": "Christoph von", "gnd": "http://d-nb.info/gnd/128862580"}]` |
+| `date_published` | `string` | Raw publication date string of the original print, as given in the header | `1642` |
+| `year` | `int64` | First four-digit number parsed from `date_published`. Null if none found | `1642` |
+| `place_of_publication` | `string` | Place of publication of the original print | `Breslau` |
+| `publisher` | `string` | Publisher name(s), joined with `\n` | `Georgius Baumann` |
+| `edition` | `string` | Edition statement (text, or the `n` attribute if the element has no text) | `2. Auflage` |
+| `num_pages` | `int64` | Page count of the original source (`measure type="pages"`) | `72` |
+| `repository` | `string` | Holding library of the digitized copy | `Universitätsbibliothek Breslau` |
+| `shelfmark` | `string` | Shelfmark of the copy at the repository | `Universitätsbibliothek Breslau, 4 A 277/11 / 343016` |
+| `typeface` | `string` | Typeface of the original print | `Fraktur` |
+| `bibl` | `string` | Short bibliographic citation string | `Reideburg, Christoph von: Kurtze Anleitung: Wie die jetzige böse Zeit/ ... Breslau, 1642.` |
+| `genre_dtamain` | `string` | Main genre, DTA scheme | `Gebrauchsliteratur` |
+| `genre_dtasub` | `string` | Sub genre, DTA scheme | `Leichenpredigt` |
+| `genre_dwds1main` | `string` | Main genre, DWDS scheme | `Belletristik` |
+| `genre_dwds1sub` | `string` | Sub genre, DWDS scheme | `Prosa` |
+| `dta_corpus_labels` | `list<string>` | DTA (sub)corpus membership labels (`DTACorpus` class codes) | `["ready", "core"]` |
+| `language` | `string` | ISO 639-3 code of the primary language | `deu` |
+| `language_note` | `string` | Human-readable language label from the header | `(Früh-)Neuhochdeutsch` |
+| `license` | `string` | Per-work license URL exactly as given in the header. Varies across the corpus | `http://creativecommons.org/licenses/by-sa/3.0/de/` |
+| `license_family` | `string` | Normalized license identifier derived from `license` (http/https, `/de/`, `deed` variants collapsed) | `cc-by-sa-3.0` |
+| `num_images` | `int64` | Number of page images (DTA extent measure) | `72` |
+| `num_tokens` | `int64` | Number of tokens (DTA extent measure) | `11515` |
+| `num_types` | `int64` | Number of word types (DTA extent measure) | `3440` |
+| `num_characters` | `int64` | Number of characters (DTA extent measure) | `78795` |
+| `num_sentences` | `int64` | Sentence count from the `full/` sentence layer. Null if the work has no `full/` file | `842` |
+| `text` | `string` | Historical transcription. Layout-faithful `<text>` layer from `simple/` (line breaks, long s `ſ`, combining diacritics), or space-joined tokens if only `full/` exists | `Kurtze Anleitung:\nWie die jetzige boͤſe Zeit/ darinnen zwar fuͤr ſich ſelbſt/ ...` |
+| `text_source` | `string` | Origin of `text`: `layout` (from `simple/`) or `tokens` (reconstructed from the `full/` token layer) | `layout` |
+| `text_normalized` | `string` | Modern orthography: `full/` token layer with CAB `replace` corrections applied, space-joined. Null if the work has no `full/` file | `Kurze Anleitung : Wie die jetzige böse Zeit / darinnen zwar für sich selbst / ...` |
+
+### Example row
+
+```json
+{
+  "id": "343016",
+  "dta_id": "200006",
+  "urn": "urn:nbn:de:kobv:b4-200006-1",
+  "url": "https://www.deutschestextarchiv.de/343016",
+  "title": "Kurtze Anleitung: Wie die jetzige böse Zeit/ darinnen zwar für sich selbst/ nichts/ alß eytel Klag/ Ach/ vnd Weh regieret",
+  "authors": [{"surname": "Reideburg", "forename": "Christoph von", "gnd": "http://d-nb.info/gnd/128862580"}],
+  "date_published": "1642",
+  "year": 1642,
+  "place_of_publication": "Breslau",
+  "publisher": "Georgius Baumann",
+  "repository": "Universitätsbibliothek Breslau",
+  "typeface": "Fraktur",
+  "genre_dtamain": "Gebrauchsliteratur",
+  "genre_dtasub": "Leichenpredigt",
+  "dta_corpus_labels": ["ready", "aedit"],
+  "language": "deu",
+  "language_note": "(Früh-)Neuhochdeutsch",
+  "license": "http://creativecommons.org/licenses/by-sa/3.0/de/",
+  "license_family": "cc-by-sa-3.0",
+  "num_tokens": 11515,
+  "num_sentences": 842,
+  "text": "Kurtze Anleitung:\nWie die jetzige boͤſe Zeit/ darinnen zwar fuͤr ſich ſelbſt/\nnichts/ alß eytel Klag/ Ach/ vnd Weh regieret; ...",
+  "text_source": "layout",
+  "text_normalized": "Kurze Anleitung : Wie die jetzige böse Zeit / darinnen zwar für sich selbst / nichts / als eitel Klage / Ach / und Weh regieret ; ..."
+}
+```
+
+## Dataset creation
+
+### Source data
+
+The DTA is a reference corpus of printed German from the late 15th to the early 20th century, curated by the
+Berlin-Brandenburg Academy of Sciences and Humanities (BBAW). Texts were transcribed by double keying from
+first editions wherever possible, and are published with TEI headers, sentence and token layers and
+orthographic normalization from the CAB tool chain.
+
+This dataset was built from the complete TCF dump `dta_komplett_2026-02-10`, which comes in two variants:
+
+* `simple/` (5,107 files): CMDI metadata and the layout-faithful historical text (`<text>` layer);
+* `full/` (5,471 files): CMDI metadata and the annotation layers (tokens, sentences, orthography).
+
+The union of both variants gives 5,481 works. One work (`ford_pitty_1633`) is excluded because its TCF file is
+not well-formed XML.
+
+### Processing
+
+* `text` comes from `simple/` where available (`text_source = "layout"`, 5,105 docs). For the 375 works only
+  present in `full/`, it is reconstructed by space-joining the token layer (`text_source = "tokens"`), so
+  line breaks and the original whitespace are lost there.
+* `text_normalized` is the `full/` token layer with CAB `replace` corrections applied (multi-token corrections
+  replace the whole span), space-joined. It is null for the 10 works only present in `simple/`.
+* Metadata is deliberately kept un-flattened: authors are a list of structs, all four genre schemes are
+  separate columns, the raw license URL is kept next to a normalized `license_family`.
+* `num_tokens`, `num_types`, `num_characters`, `num_images` and `num_pages` are the extent measures from the
+  DTA header, not recomputed values.
+
+The conversion script and the statistics script are available in the
+[dta-experiments](https://github.com/histde/dta-experiments) repository.
+
+## Statistics
+
+All tables below were produced with `dta_dataset_stats.py` from the released Parquet shards.
+
+### Overview
+
+| statistic | value |
+|---|---|
+| Documents | 5,480 |
+| Documents with normalized text (full/ layer) | 5,470 (99.8%) |
+| Documents with at least one author | 3,104 (56.6%) |
+| Distinct authors (by GND id) | 1,317 |
+| Year range | 1472-1987 (1 unknown) |
+| Median year | 1836 |
+| Tokens (header measure) | 204,582,701 |
+| Types (header measure) | 33,741,287 |
+| Characters (header measure) | 1,423,995,435 |
+| Characters in `text` column | 1,380,752,264 |
+| Characters in `text_normalized` column | 1,370,639,606 |
+| Sentences (full/ layer) | 10,376,423 |
+| Page images | 761,995 |
+| Median tokens per document | 10,394 |
+| Median pages (images) per document | 16 |
+
+### Temporal distribution (50-year bins)
+
+| period | docs | sentences | tokens | characters | token share |
+|---|---:|---:|---:|---:|---:|
+| 1450–1499 | 15 | 1,899 | 177,258 | 997,389 | 0.1% |
+| 1500–1549 | 17 | 10,469 | 308,471 | 1,915,965 | 0.2% |
+| 1550–1599 | 98 | 139,035 | 3,572,336 | 23,618,803 | 1.7% |
+| 1600–1649 | 422 | 433,762 | 9,757,100 | 66,033,889 | 4.8% |
+| 1650–1699 | 691 | 1,118,361 | 23,338,594 | 159,938,400 | 11.4% |
+| 1700–1749 | 435 | 1,143,293 | 24,779,141 | 171,116,209 | 12.1% |
+| 1750–1799 | 583 | 1,566,582 | 30,933,941 | 214,031,382 | 15.1% |
+| 1800–1849 | 1,618 | 2,000,919 | 40,798,688 | 284,536,219 | 19.9% |
+| 1850–1899 | 1,143 | 3,086,868 | 55,792,116 | 393,248,560 | 27.3% |
+| 1900–1949 | 444 | 737,908 | 13,114,628 | 95,203,044 | 6.4% |
+| 1950–1999 | 13 | 137,150 | 2,005,488 | 13,321,270 | 1.0% |
+| unknown | 1 | 177 | 4,940 | 34,305 | 0.0% |
+| **total** | **5,480** | **10,376,423** | **204,582,701** | **1,423,995,435** | **100%** |
+
+### Text source
+
+| text_source | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| `layout` | 5,105 | 93.2% | 185,164,389 | 90.5% |
+| `tokens` | 375 | 6.8% | 19,418,312 | 9.5% |
+
+### Language
+
+| language | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| `deu` | 5,477 | 99.9% | 204,523,746 | 100.0% |
+| `lat` | 2 | 0.0% | 56,714 | 0.0% |
+| `gml` | 1 | 0.0% | 2,241 | 0.0% |
+
+### Genre (DWDS main)
+
+| genre_dwds1main | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| Zeitung | 2,036 | 37.2% | 17,152,284 | 8.4% |
+| Gebrauchsliteratur | 1,718 | 31.4% | 58,283,320 | 28.5% |
+| Wissenschaft | 953 | 17.4% | 87,148,247 | 42.6% |
+| Belletristik | 773 | 14.1% | 41,998,850 | 20.5% |
+
+<details>
+<summary>Genre (DWDS sub, top 10)</summary>
+
+| genre_dwds1sub | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| unknown | 2,036 | 37.2% | 17,152,284 | 8.4% |
+| Leichenpredigt | 336 | 6.1% | 3,517,225 | 1.7% |
+| Zeitschrift | 217 | 4.0% | 1,697,733 | 0.8% |
+| Theologie | 214 | 3.9% | 10,486,746 | 5.1% |
+| Brief | 204 | 3.7% | 84,325 | 0.0% |
+| Roman | 198 | 3.6% | 13,211,036 | 6.5% |
+| Gesellschaft | 165 | 3.0% | 3,852,413 | 1.9% |
+| Novelle | 126 | 2.3% | 3,031,211 | 1.5% |
+| Lyrik | 125 | 2.3% | 5,090,960 | 2.5% |
+| Gelegenheitsschrift:Tod | 116 | 2.1% | 103,280 | 0.1% |
+| *other (123 values)* | 1,743 | 31.8% | 146,355,488 | 71.5% |
+
+</details>
+
+<details>
+<summary>Genre (DTA main)</summary>
+
+| genre_dtamain | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| unknown | 3,468 | 63.3% | 69,372,311 | 33.9% |
+| Fachtext | 743 | 13.6% | 78,106,238 | 38.2% |
+| Belletristik | 561 | 10.2% | 33,626,235 | 16.4% |
+| Gebrauchsliteratur | 536 | 9.8% | 22,981,508 | 11.2% |
+| Wissenschaftliche Abhandlungen in Form gedruckter Briefe | 50 | 0.9% | 89,564 | 0.0% |
+| Abhandlungen in Zeitschriften, Sammelbänden etc. | 36 | 0.7% | 145,342 | 0.1% |
+| Ankündigungen, Berichtigungen und kurze Nachrichten | 29 | 0.5% | 25,687 | 0.0% |
+| Berliner Akademiereden/-schriften und andere Reden | 17 | 0.3% | 71,027 | 0.0% |
+| Rezensionen | 7 | 0.1% | 8,514 | 0.0% |
+| Pariser Akademiereden/-schriften | 6 | 0.1% | 16,728 | 0.0% |
+| Vorworte und andere Beiträge Humboldts in Schriften anderer Autoren, Lexikonartikel | 6 | 0.1% | 20,581 | 0.0% |
+| Gelegenheitsschrift | 5 | 0.1% | 49,906 | 0.0% |
+| Journalismus | 5 | 0.1% | 54,829 | 0.0% |
+| Albumblätter | 3 | 0.1% | 812 | 0.0% |
+| Gutachten | 3 | 0.1% | 6,339 | 0.0% |
+| Sonderdrucke und andere Grenzfälle zu selbständig erschienenen Schriften | 2 | 0.0% | 3,358 | 0.0% |
+| Wissenschaft | 2 | 0.0% | 3,124 | 0.0% |
+| Sachliteratur | 1 | 0.0% | 598 | 0.0% |
+
+</details>
+
+<details>
+<summary>Genre (DTA sub, top 10)</summary>
+
+| genre_dtasub | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| unknown | 3,628 | 66.2% | 69,896,619 | 34.2% |
+| Leichenpredigt | 334 | 6.1% | 3,495,630 | 1.7% |
+| Roman | 163 | 3.0% | 11,534,905 | 5.6% |
+| Prosa | 128 | 2.3% | 10,291,868 | 5.0% |
+| Lyrik | 114 | 2.1% | 4,731,157 | 2.3% |
+| Drama | 82 | 1.5% | 2,330,599 | 1.1% |
+| Recht | 79 | 1.4% | 9,743,726 | 4.8% |
+| Philosophie | 76 | 1.4% | 5,426,303 | 2.7% |
+| Historiographie | 46 | 0.8% | 7,221,703 | 3.5% |
+| Medizin | 46 | 0.8% | 6,013,804 | 2.9% |
+| *other (86 values)* | 784 | 14.3% | 73,896,387 | 36.1% |
+
+</details>
+
+### Typeface
+
+| typeface | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| Fraktur | 4,478 | 81.7% | 164,623,059 | 80.5% |
+| Antiqua | 427 | 7.8% | 35,856,371 | 17.5% |
+| Schwabacher | 338 | 6.2% | 724,934 | 0.4% |
+| Handschrift | 218 | 4.0% | 1,315,690 | 0.6% |
+| Jean-Paul-Fraktur | 9 | 0.2% | 1,409,611 | 0.7% |
+| Current | 2 | 0.0% | 1,963 | 0.0% |
+| Rotunda | 2 | 0.0% | 313,225 | 0.2% |
+| Antiqua (Schreibmaschine) | 1 | 0.0% | 34,176 | 0.0% |
+| Antiqua, Kursive | 1 | 0.0% | 18,883 | 0.0% |
+| Antqiua | 1 | 0.0% | 3,527 | 0.0% |
+| Frakur | 1 | 0.0% | 10,103 | 0.0% |
+| Textur | 1 | 0.0% | 270,599 | 0.1% |
+| unknown | 1 | 0.0% | 560 | 0.0% |
+
+Values are taken verbatim from the headers, including the two typos (`Antqiua`, `Frakur`).
+
+<details>
+<summary>DTA corpus labels (a document can carry several)</summary>
+
+| label | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| `ready` | 5,480 | 100.0% | 204,582,701 | 100.0% |
+| `core` | 1,478 | 27.0% | 130,114,948 | 63.6% |
+| `china` | 1,149 | 21.0% | 111,416,242 | 54.5% |
+| `mkhz1` | 625 | 11.4% | 3,996,672 | 2.0% |
+| `nrhz` | 530 | 9.7% | 4,290,483 | 2.1% |
+| `aedit` | 335 | 6.1% | 3,508,098 | 1.7% |
+| `mts` | 320 | 5.8% | 18,006,989 | 8.8% |
+| `lefevre` | 319 | 5.8% | 476,390 | 0.2% |
+| `dtae` | 244 | 4.5% | 21,475,420 | 10.5% |
+| `mkhz2` | 222 | 4.1% | 2,169,371 | 1.1% |
+| `correspondent` | 204 | 3.7% | 925,755 | 0.5% |
+| `tevo` | 202 | 3.7% | 5,682,395 | 2.8% |
+| `sanders-briefe` | 190 | 3.5% | 61,890 | 0.0% |
+| `hab` | 184 | 3.4% | 10,256,959 | 5.0% |
+| `augsburgerallgemeine` | 181 | 3.3% | 2,761,778 | 1.3% |
+| `avh` | 172 | 3.1% | 443,668 | 0.2% |
+| `wikisource` | 169 | 3.1% | 5,787,543 | 2.8% |
+| `sbb_funeralschriften` | 112 | 2.0% | 77,981 | 0.0% |
+| `tdef` | 109 | 2.0% | 940,772 | 0.5% |
+| `novellenschatz` | 87 | 1.6% | 1,643,336 | 0.8% |
+| `blumenbach` | 33 | 0.6% | 2,688,412 | 1.3% |
+| `epoetics` | 23 | 0.4% | 3,074,730 | 1.5% |
+| `frauenstudium` | 22 | 0.4% | 134,198 | 0.1% |
+| `psyleko` | 19 | 0.3% | 2,075,500 | 1.0% |
+| `ntsm` | 11 | 0.2% | 32,139 | 0.0% |
+| `avhkv` | 9 | 0.2% | 636,539 | 0.3% |
+| `briefjeanpaul` | 9 | 0.2% | 1,409,611 | 0.7% |
+| `gutenberg_org` | 8 | 0.1% | 325,940 | 0.2% |
+| `gutzkow` | 7 | 0.1% | 478,246 | 0.2% |
+| `dwds1` | 5 | 0.1% | 465,688 | 0.2% |
+| `gei` | 2 | 0.0% | 57,474 | 0.0% |
+| `gutenberg_de` | 2 | 0.0% | 116,184 | 0.1% |
+| `gwb` | 2 | 0.0% | 80,666 | 0.0% |
+| `urmel` | 2 | 0.0% | 1,068 | 0.0% |
+| `zbk` | 2 | 0.0% | 48,127 | 0.0% |
+| `greflinger` | 1 | 0.0% | 9,079 | 0.0% |
+| `grenzboten` | 1 | 0.0% | 116,208 | 0.1% |
+
+The `core` label marks the curated DTA core corpus (1,478 works, 63.6% of all tokens), which is the
+balanced selection by genre and period. The other labels denote extension corpora (DTAE) contributed by
+partner projects.
+
+</details>
+
+<details>
+<summary>Place of publication (top 10)</summary>
+
+| place | docs | docs % | tokens | tokens % |
+|---|---:|---:|---:|---:|
+| Berlin | 604 | 11.0% | 30,616,946 | 15.0% |
+| Köln | 532 | 9.7% | 4,682,997 | 2.3% |
+| Leipzig | 425 | 7.8% | 41,950,384 | 20.5% |
+| Hamburg | 330 | 6.0% | 5,514,413 | 2.7% |
+| Augsburg | 256 | 4.7% | 4,581,351 | 2.2% |
+| Altstrelitz | 172 | 3.1% | 57,702 | 0.0% |
+| unknown | 160 | 2.9% | 980,933 | 0.5% |
+| München | 153 | 2.8% | 3,434,662 | 1.7% |
+| Frankfurt (Main) | 141 | 2.6% | 11,430,873 | 5.6% |
+| Königsberg | 133 | 2.4% | 926,843 | 0.5% |
+| *other (246 values)* | 2,574 | 47.0% | 100,405,597 | 49.1% |
+
+</details>
+
+### Most frequent authors (top 10)
+
+| author | GND | docs | tokens |
+|---|---|---:|---:|
+| Humboldt, Alexander von | http://d-nb.info/gnd/118554700 | 183 | 1,504,828 |
+| Sanders, Daniel | http://d-nb.info/gnd/119242044 | 173 | 69,412 |
+| Dach, Simon | http://d-nb.info/gnd/11852321X | 112 | 77,981 |
+| N. N. | | 51 | 1,882,041 |
+| Blumenbach, Johann Friedrich | http://d-nb.info/gnd/116208503 | 35 | 2,814,553 |
+| Sattler, Basilius | http://d-nb.info/gnd/116974788 | 26 | 352,365 |
+| Goethe, Johann Wolfgang von | http://d-nb.info/gnd/118540238 | 24 | 1,064,748 |
+| Herder, Johann Gottfried von | http://d-nb.info/gnd/118549553 | 23 | 690,276 |
+| Grimm, Jacob | http://d-nb.info/gnd/118542257 | 17 | 2,441,309 |
+| Fontane, Theodor | http://d-nb.info/gnd/118534262 | 16 | 1,262,140 |
+
+## Licensing
+
+The DTA publishes every work under its own license, and this dataset keeps that information per row in the
+`license` (raw URL from the header) and `license_family` (normalized) columns. There is **no single license**
+for the whole dataset. Note that only `cc0-1.0` is a public domain dedication; all `cc-by-*` licenses carry
+binding conditions (attribution, share-alike, or non-commercial use), and about 28% of the documents are
+restricted to non-commercial use (`cc-by-nc-3.0`, `cc-by-nc-sa-4.0`, `noc-nc-1.0`, `out-of-copyright-nc`).
+
+| license family | docs | docs % | tokens | tokens % | license URLs |
+|---|---:|---:|---:|---:|---|
+| `cc-by-sa-4.0` | 2,644 | 48.2% | 139,433,878 | 68.2% | http://creativecommons.org/licenses/by-sa/4.0/<br>http://creativecommons.org/licenses/by-sa/4.0/deed.de/<br>https://creativecommons.org/licenses/by-sa/4.0/<br>https://creativecommons.org/licenses/by-sa/4.0/deed.de |
+| `cc-by-nc-3.0` | 1,559 | 28.4% | 20,418,259 | 10.0% | http://creativecommons.org/licenses/by-nc/3.0/<br>http://creativecommons.org/licenses/by-nc/3.0/de<br>http://creativecommons.org/licenses/by-nc/3.0/de/ |
+| `cc-by-sa-3.0` | 623 | 11.4% | 15,287,129 | 7.5% | http://creativecommons.org/licenses/by-sa/3.0/<br>http://creativecommons.org/licenses/by-sa/3.0/de<br>http://creativecommons.org/licenses/by-sa/3.0/de/<br>https://creativecommons.org/licenses/by-sa/3.0/<br>https://creativecommons.org/licenses/by-sa/3.0/de/ |
+| `cc0-1.0` | 370 | 6.8% | 16,938,595 | 8.3% | http://creativecommons.org/publicdomain/zero/1.0/ |
+| `cc-by-4.0` | 215 | 3.9% | 8,189,539 | 4.0% | http://creativecommons.org/licenses/by/4.0/<br>http://creativecommons.org/licenses/by/4.0/deed.de<br>https://creativecommons.org/licenses/by/4.0/<br>https://creativecommons.org/licenses/by/4.0/deed.de |
+| `cc-by-sa-2.0` | 51 | 0.9% | 3,058,054 | 1.5% | http://creativecommons.org/licenses/by-sa/2.0/de<br>http://creativecommons.org/licenses/by-sa/2.0/de/ |
+| `gutenberg` | 9 | 0.2% | 344,316 | 0.2% | https://web.archive.org/web/20180927123034/http://www.gutenberg.org/wiki/Gutenberg:The_Project_Gutenberg_License |
+| `cc-by-3.0` | 3 | 0.1% | 571,346 | 0.3% | http://creativecommons.org/licenses/by/3.0/de/ |
+| `cc-by-nc-sa-4.0` | 2 | 0.0% | 19,672 | 0.0% | https://creativecommons.org/licenses/by-nc-sa/4.0/<br>https://creativecommons.org/licenses/by-nc-sa/4.0/deed.de |
+| `mdz-copyright` | 1 | 0.0% | 24,964 | 0.0% | http://mdz.bib-bvb.de/copyright.htm |
+| `noc-nc-1.0` | 1 | 0.0% | 125,859 | 0.1% | http://rightsstatements.org/vocab/NoC-NC/1.0/ |
+| `nug-kkn` | 1 | 0.0% | 55,702 | 0.0% | http://www.deutsche-digitale-bibliothek.de/lizenzen/nug-kkn/ |
+| `out-of-copyright-nc` | 1 | 0.0% | 115,388 | 0.1% | https://www.europeana.eu/portal/de/rights/out-of-copyright-non-commercial.html |
+| **total** | **5,480** | **100%** | **204,582,701** | **100%** | |
+
+To select a subset that fits your use case:
+
+```python
+ds_sa = ds.filter(lambda d: d["license_family"] in {"cc0-1.0", "cc-by-4.0", "cc-by-3.0", "cc-by-sa-4.0", "cc-by-sa-3.0", "cc-by-sa-2.0"})
+```
+
+## Considerations for using the data
+
+* **Coverage is uneven.** Roughly 60% of the tokens date from 1750 to 1899; the 15th and 16th centuries are
+  thinly covered. Newspapers (`Zeitung`) dominate the document count but make up only 8% of the tokens, and
+  a single project (Alexander von Humboldt's writings) contributes 183 short documents.
+* **Historical content.** The texts reflect the views, language and stereotypes of their time, including
+  religious, political and colonial-era writing. They are provided for research on historical German and
+  should not be taken as statements of fact or acceptable opinion.
+* **Normalization is automatic.** `text_normalized` comes from the CAB tool chain and is not manually
+  corrected. Expect residual errors, especially for very early texts, Latin passages, and proper names. The
+  normalized text is also whitespace-tokenized (punctuation is separated by spaces), whereas `text` keeps the
+  original layout.
+* **`text` is not uniform.** 375 documents have their historical text reconstructed from the token layer and
+  lack line breaks; check `text_source` if layout matters to you.
+* **Metadata quirks.** Genre fields are null for a large share of the works in the DTA scheme (use the DWDS
+  scheme for complete main-genre coverage), typeface strings contain a few typos, and `year` is parsed
+  heuristically from the free-text `date_published`.
+
+## Citation
+
+Please cite the DTA when using this dataset:
+
+```bibtex
+@misc{dta2026,
+  author       = {{Berlin-Brandenburgische Akademie der Wissenschaften}},
+  title        = {Deutsches Textarchiv. Grundlage für ein Referenzkorpus der neuhochdeutschen Sprache},
+  year         = {2026},
+  address      = {Berlin},
+  howpublished = {Herausgegeben von der Berlin-Brandenburgischen Akademie der Wissenschaften},
+  url          = {https://www.deutschestextarchiv.de/}
+}
+```
+
+## Acknowledgements
+
+A big thank you to the whole team of the Deutsches Textarchiv at the Berlin-Brandenburg Academy of Sciences
+and Humanities! Also many thanks to all the partner projects, libraries and archives that contributed texts to the DTA
+extension corpora.
+
+This dataset only converts an official dump into Parquet for convenient use with the Hugging Face ecosystem.
+
+## AI disclosure
+
+This dataset card was drafted with Claude Fable 5 (claude-fable-5) based on the statistics produced by
+`dta_dataset_stats.py`, and reviewed by the dataset author. The conversion and statistics scripts carry their
+own AI disclosure blocks, following the rules in the [ai-disclosure](https://github.com/stefan-it/ai-disclosure) repository.