Datasets:
ArXiv:
| <!--// Auto-generated schema documentation, 2025-07-30 //--> | |
| # MegaWika 2.0 Data Schema | |
| MegaWika 2 is structured as a collection of JSON-lines "chunk" files | |
| organized by Wikipedia language. Each chunk file contains a collection | |
| of Article objects, one (JSON-encoded) Article per line. What follows is | |
| documentation for each type in the schema, starting with Article. | |
| ## Article | |
| ### Fields | |
| - **title** (string): Article title | |
| - Ex: `"Les Hauts de Hurlevent est l'unique roman d'Emily Brontë ..."` | |
| - **wikicode** (string): Wikimedia source code for article | |
| - Ex: `"<div id=\"mp_header\" class=\"mp_outerbox\"> ..."` | |
| - **hash** (string): Hash of title and content | |
| - Ex: `"2c0c3bfb0493fb8ddd5661..."` | |
| - **last\_revision** (string): Datetime of last revision | |
| - Ex: `"2023-12-03T10:50:40Z"` | |
| - **first\_revision** (string | null): Datetime of initial article creation, if it could be retrieved. | |
| - Ex: `"2023-09-04T08:19:40Z"` | |
| - **first\_revision\_access\_date** (string | null): Datetime first revision was retrieved from Wikipedia Action API | |
| - Ex: `"2023-12-03T10:55:40Z"` | |
| - **cross\_lingual\_links** (object[string, string] | null): A dictionary mapping this article onto articles on the same topic in other languages; keys represent language codes, values represent the title of the article in that language. | |
| - Ex: `{"en": "Wuthering Heights", "es": "Cumbres Borrascosas"}` | |
| - **cross\_lingual\_links\_access\_date** (string | null): Datetime cross-lingual links were retrieved from Wikipedia Action API | |
| - Ex: `"2023-12-03T10:56:40Z"` | |
| - **text** (string): Natural-language text of article | |
| - Ex: `"Les Hauts de Hurlevent est l'unique roman d'Emily Brontë ..."` | |
| - **elements** (array[[Heading](#heading) | [Table](#table) | [Infobox](#infobox) | [Paragraph](#paragraph) | [Math](#math) | [Code](#code) | [Preformatted](#preformatted)]): Article structure: paragraphs, text and citation elements, etc. | |
| - **excerpts\_with\_citations** (array[[ExcerptWithCitations](#excerptwithcitations)]): A list of all citations from the article and the associated text excerpts they appear in. This data is a postprocessed subset of the data in the elements list and is provided for convenience. | |
| ## Citation | |
| ### Fields | |
| - **content** (string): Citation content | |
| - Ex: `"<ref>{{Citation |last=Thomas |first=Darcy |year=2013 ..."` | |
| - **char\_index** (integer): Character index of this citation in the enclosing sentence or excerpt | |
| - Ex: `39` | |
| - **name** (string | null): Optional citation name | |
| - Ex: `null` | |
| - Ex: `"Thomas2013"` | |
| - **url** (string | null): Extracted URL, if web citation | |
| - Ex: `"https://example.com/emily-bronte/..."` | |
| - **source\_text** (string | null): Extracted source text, if source download and extraction succeeded | |
| - Ex: `"Emily Brontë avait deux sœurs ..."` | |
| - **source\_code\_content\_type** (string | null): Downloaded source code content type, if download succeeded and content-type header was received | |
| - Ex: `"text/html"` | |
| - Ex: `"text/html; charset=ISO-8859-1"` | |
| - **source\_code\_num\_bytes** (integer | null): Not used | |
| - Ex: `null` | |
| - **source\_code\_num\_chars** (integer | null): Size of downloaded source code in characters, if source download succeeded and code can be decoded as text | |
| - Ex: `100000` | |
| - **source\_download\_date** (string | null): Datetime source code was downloaded from the web | |
| - Ex: `"2023-12-03T10:50:40Z"` | |
| - **source\_download\_error** (string | null): Source download error message, if there was an error | |
| - Ex: `null` | |
| - Ex: `"Download is too large (2.4 MB)"` | |
| - Ex: `"ConnectTimeoutError: ..."` | |
| - **source\_extract\_error** (string | null): Source extraction error message, if there was an error | |
| - Ex: `null` | |
| - Ex: `"Text is too short (50 words)"` | |
| - Ex: `"Exception: ..."` | |
| - **source\_snippet** (string | null): A relevant snippet from the source document, excertped manually by Wikipedia editor; stored in the `quote` field of the relevant citation templates. | |
| - Ex: `"Emily Brontë avait deux sœurs"` | |
| - **source\_quality\_label** (integer | null): An integer between 1 and 5 representing the predicted relevance and quality of the text extracted from the source page: 1 is irrelevant content like 404 text and paywalls, 2 is likely irrelevant or unreadable content like a list of headlines or mangled table, 3 is potentially relevant content like a book abstract, 4 is likely relevant content but with some quality issues, and 5 is relevant content that is well-formatted. | |
| - Ex: `4` | |
| - **source\_quality\_raw\_score** (number | null): The raw score output by the source quality regression model, generally between 0 and 1. The source quality label is computed from the raw score and has a monotonic but non-linear relationship. | |
| - Ex: `0.8` | |
| ### Example JSON | |
| ```json | |
| { | |
| "content": "<ref>{{Citation |last=Thomas |first=Darcy |year=2013 ...", | |
| "char_index": 39, | |
| "name": null, | |
| "url": "https://example.com/emily-bronte/...", | |
| "source_text": "Emily Brontë avait deux sœurs ...", | |
| "source_code_content_type": "text/html", | |
| "source_code_num_bytes": null, | |
| "source_code_num_chars": 100000, | |
| "source_download_date": "2023-12-03T10:50:40Z", | |
| "source_download_error": null, | |
| "source_extract_error": null, | |
| "source_snippet": "Emily Brontë avait deux sœurs", | |
| "source_quality_label": 4, | |
| "source_quality_raw_score": 0.8 | |
| } | |
| ``` | |
| ## CitationNeeded | |
| ### Fields | |
| - **type** (const string = `"citation-needed"`): Used to differentiate from other element types | |
| - **content** (string): Citation-needed element content | |
| - Ex: `"{{Citation needed|date=September 2015}}"` | |
| - **char\_index** (integer): Character index of this citation-needed in the enclosing sentence or excerpt | |
| - Ex: `39` | |
| ### Example JSON | |
| ```json | |
| { | |
| "type": "citation-needed", | |
| "content": "{{Citation needed|date=September 2015}}", | |
| "char_index": 39 | |
| } | |
| ``` | |
| ## Code | |
| ### Fields | |
| - **type** (const string = `"code"`): Used to differentiate from other element types | |
| - **language** (string | null): Code language (as used for syntax highlighting) | |
| - Ex: `"cpp"` | |
| - **content** (string): Code block content | |
| - Ex: `"int main() { ..."` | |
| ### Example JSON | |
| ```json | |
| { | |
| "type": "code", | |
| "language": "cpp", | |
| "content": "int main() { ..." | |
| } | |
| ``` | |
| ## ExcerptWithCitations | |
| ### Fields | |
| - **text** (string): The text of three consecutive sentences from an article | |
| - Ex: `"Les Hauts de Hurlevent est .... défis à la culture victorienne."` | |
| - **translated\_text** (string | null): English translation of the excerpt text, if not in English Wikipedia | |
| - Ex: `"Wuthering Heights is .... challenges to Victorian culture."` | |
| - **citations** (array[[Citation](#citation)]): Citation(s) appearing in the final sentence of this excerpt | |
| ## Heading | |
| ### Fields | |
| - **type** (const string = `"heading"`): Used to differentiate from other element types | |
| - **text** (string): Heading text | |
| - Ex: `"Personnages"` | |
| - **translated\_text** (string | null): English translation of heading text, if not in English Wikipedia | |
| - Ex: `"Characters"` | |
| - **level** (integer): Heading level (1 being top-level/most general, 6 being bottom-level/most specific) | |
| - Ex: `2` | |
| - **citations** (array[[Citation](#citation)]): Citations appearing in this heading | |
| - **citations\_needed** (array[[CitationNeeded](#citationneeded)]): Citation-needed elements appearing in this heading | |
| ## Infobox | |
| ### Fields | |
| - **type** (const string = `"infobox"`): Used to differentiate from other element types | |
| - **content** (string): Infobox content | |
| - Ex: `"{{Infobox Livre\n| auteur = Emily Brontë\n...\n}"` | |
| ### Example JSON | |
| ```json | |
| { | |
| "type": "infobox", | |
| "content": "{{Infobox Livre\n| auteur = Emily Brontë\n...\n}" | |
| } | |
| ``` | |
| ## Math | |
| ### Fields | |
| - **type** (const string = `"math"`): Used to differentiate from other element types | |
| - **content** (string): Math block content | |
| - Ex: `"\\sin 2\\pi x + \\ln e ..."` | |
| ### Example JSON | |
| ```json | |
| { | |
| "type": "math", | |
| "content": "\\sin 2\\pi x + \\ln e ..." | |
| } | |
| ``` | |
| ## Paragraph | |
| ### Fields | |
| - **type** (const string = `"paragraph"`): Used to differentiate from other element types | |
| - **sentences** (array[[Sentence](#sentence)]): List of sentences in this paragraph | |
| ## Preformatted | |
| ### Fields | |
| - **type** (const string = `"preformatted"`): Used to differentiate from other element types | |
| - **content** (string): Preformatted block content | |
| - Ex: `"____\n|DD|____T_\n|_ |_____|<\n @-@-@-oo\\\n"` | |
| ### Example JSON | |
| ```json | |
| { | |
| "type": "preformatted", | |
| "content": "____\n|DD|____T_\n|_ |_____|<\n @-@-@-oo\\\n" | |
| } | |
| ``` | |
| ## Sentence | |
| ### Fields | |
| - **text** (string): Sentence text content | |
| - Ex: `"Les Hauts de Hurlevent est l'unique roman d'Emily Brontë."` | |
| - **translated\_text** (string | null): English translation of sentence text content, if not in English Wikipedia | |
| - Ex: `"Wuthering Heights is the only novel by Emily Brontë."` | |
| - **trailing\_whitespace** (string): If the sentence was originally followed by whitespace, this will be a space. If the sentence was not followed by whitespace (for example, if it was followed by a quotation mark), this will be the empty string. | |
| - Ex: `" "` | |
| - Ex: `""` | |
| - **citations** (array[[Citation](#citation)]): Citations appearing in this sentence | |
| - **citations\_needed** (array[[CitationNeeded](#citationneeded)]): Citation-needed elements appearing in this sentence | |
| ## Table | |
| ### Fields | |
| - **type** (const string = `"table"`): Used to differentiate from other element types | |
| - **content** (string): Table content | |
| - Ex: `"{| class=\"wikitable\"\n|+ Personnages\n|-\n! Nom !! ...\n...\n|}"` | |
| ### Example JSON | |
| ```json | |
| { | |
| "type": "table", | |
| "content": "{| class=\"wikitable\"\n|+ Personnages\n|-\n! Nom !! ...\n...\n|}" | |
| } | |
| ``` | |