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<h1 id="wcite">wcite</h1>
<blockquote>
<p>Use Wikidata as reference manager</p>
</blockquote>
<p><a href="https://www.npmjs.org/package/wcite"><img src="https://img.shields.io/npm/v/wcite.svg?style=flat" alt="NPM Version" /></a> <a href="https://travis-ci.org/wikicite/wcite"><img src="https://travis-ci.org/wikicite/wcite.svg?branch=master" alt="Build Status" /></a> <a href="https://github.com/wikicite/wcite/issues"><img src="https://img.shields.io/github/issues-raw/wikicite/wcite.svg?style=flat" alt="Open Issues" /></a> <a href="https://standardjs.com"><img src="https://img.shields.io/badge/code_style-standard-brightgreen.svg" alt="JavaScript Style Guide" /></a> <a href="https://github.com/wikicite/wcite/blob/master/LICENSE.md"><img src="https://img.shields.io/github/license/wikicite/wcite.svg" alt="license" /></a> <a href="https://codeclimate.com/github/wikicite/wcite/maintainability"><img src="https://api.codeclimate.com/v1/badges/b3bd79d9e25a521d0f57/maintainability" alt="Maintainability" /></a> <a href="https://coveralls.io/github/wikicite/wcite?branch=master"><img src="https://coveralls.io/repos/github/wikicite/wcite/badge.svg?branch=master" alt="Coverage Status" /></a></p>
<p>This JavaScript package provides <a href="#command-wcite">a command line client</a> to fetch and manage bibliographic records from <a href="https://www.wikidata.org/">Wikidata</a> and a <a href="https://pandoc.org/filters.html">Pandoc filter</a> to use Wikidata item identifiers and aliases as citation keys.</p>
<h2 id="table-of-contents">Table of Contents</h2>
<ul>
<li><a href="#overview">Overview</a></li>
<li><a href="#installation">Installation</a></li>
<li><a href="#usage">Usage</a>
<ul>
<li><a href="#command-wcite">Command wcite</a></li>
<li><a href="#filter-pwcite">Filter pwcite</a></li>
<li><a href="#linking-bibliography-entries-to-Wikidata">Linking bibliography entries to Wikidata</a></li>
<li><a href="#bibliography-files">Bibliography files</a></li>
</ul></li>
<li><a href="#api">API</a></li>
<li><a href="#license">License</a></li>
<li><a href="#references">References</a></li>
</ul>
<h2 id="overview">Overview</h2>
<p><a href="https://www.wikidata.org/">Wikidata</a> contains statements about all kinds of entities such as people, places, and publications. The <a href="http://wikicite.org/">WikiCite</a> initiative promotes using Wikidata as collaboratively curated bibliography. The <a href="https://www.npmjs.org/package/wcite">JavaScript package wcite</a> provides:</p>
<ul>
<li><p>the command line client <strong><a href="#command-wcite">wcite</a></strong> to fetch bibliographic records from Wikidata and to manage them locally in <a href="#bibliography-file">bibliography files</a> for writing system such as Pandoc and LaTeX.</p></li>
<li><p>the Pandoc filter <strong><a href="#filter-pwcite">pwcite</a></strong> to use Wikidata item identifiers as citation keys in <a href="https://pandoc.org/MANUAL.html#citations">Pandoc citation syntax</a> to automatically fetch records from Wikidata.</p></li>
</ul>
<p>See <a href="#usage">usage</a> for details and examples.</p>
<h2 id="installation">Installation</h2>
<p>Install latest release:</p>
<pre><code>$ npm install -g wcite</code></pre>
<p>or install from source:</p>
<pre><code>$ git clone https://github.com/wikicite/wcite.git
$ cd wcite
$ npm install -g . # or `npm link`</code></pre>
<p>Tested with <a href="https://nodejs.org">NodeJs</a> version 8 and above.</p>
<h2 id="usage">Usage</h2>
<p>Bibliographic entities in Wikidata are referenced by their item identifier. For instance <a href="http://www.wikidata.org/entity/Q55239420"><code>Q55239420</code></a> identifies the first edition of <a href="https://en.wikipedia.org/wiki/Frankenstein">Mary Shelley’s novel <em>Frankenstein</em></a>. Its bibliographic data can be shown by calling <a href="#command-wcite">wcite</a> with the identifier:</p>
<pre><code>$ wcite Q55239420
Q55239420: Shelley, M. (1818). Frankenstein (1st ed.). London</code></pre>
<p>To locally save the bibliographic data in a <a href="#bibliography-files">bibliography file</a> pass its name as argument or with option <code>-b</code>/<code>--bibliography</code>:</p>
<pre><code>$ wcite refs.json add Q55239420
Q55239420 added</code></pre>
<p>Records from the file can be listed in multiple formats:</p>
<pre><code>$ wcite refs.json
Q55239420
$ wcite refs.json -f bibtex
@book{Q55239420,
author={Shelley, Mary},
title={Frankenstein},
edition=1,
...</code></pre>
<p>All this is done automatically with Pandoc filter <a href="#filter-pwcite">pwcite</a>.</p>
<h3 id="command-wcite">Command wcite</h3>
<p>Command line script <code>wcite</code> can fetch and transform bibliographic data from Wikidata and locally manage it in a <a href="#bibliography-files">bibliography file</a>. In addition to bibliography files the script can read and write document files with YAML header.</p>
<pre><code>Usage: wcite [options] [command] [file] [ids...]
Manage bibliographic data from Wikidata. Bibliography CSL JSON file
can be specified explicitly or via YAML header field 'bibliography'.
Options:
-V, --version output the version number
-b, --bibliography <file> Bibliography file (CSL JSON)
-d, --document <file> Document file with YAML header
-f, --format <name> Output format (text|html|bibtex|bibtxt|json|ndjson)
-o, --output <file> Output file. Format can be guessed from extension
-t, --template <name> Citation template (apa|vancouver|harvard1)
-l, --language <lang> Language codes (separate with space or comma)
-i, --ids <file> Read ids from (use `-` for stdin)
-q, --quiet Avoid status output
-h, --help output usage information
Commands:
add <ids...> add records specified by Wikidata identifiers
remove <ids...> remove records by Wikidata identifiers or aliases
get [ids...] show bibliographic records
update [ids...] update bibliographic records
list list Wikidata identifiers and aliases
help display this usage help
Examples:
$ wcite refs.json # list Wikidata ids in refs.json
$ wcite update refs.json # update all entries in refs.json
$ wcite Q18507561 # get bibliographic data from Wikidata</code></pre>
<h3 id="filter-pwcite">Filter pwcite</h3>
<p>The <a href="https://pandoc.org/filters.html">Pandoc filter</a> <code>pwcite</code> processes a document to detect citation keys that use Wikidata item identifiers. Simply write your documents in Markdown and use <a href="https://pandoc.org/MANUAL.html#citations">Pandoc citation syntax</a> to reference publications:</p>
<pre><code>Blah blah [@doe95; @doe99], disputed by @alice07.</code></pre>
<p>Publications from Wikidata can be referenced using their identifiers like this:</p>
<pre><code>Wikidata is a collaborative knowledge base [@Q18507561].</code></pre>
<p>Wikidata identifiers are hard to remember and to distinguish so you can define aliases with the <code>citekeys</code> field of your <a href="https://pandoc.org/MANUAL.html#extension-yaml_metadata_block">document metadata</a>:</p>
<pre><code>---
citekeys:
Vrand04: Q18507561
...
Wikidata is a collaborative knowledge base [@Vrand04].</code></pre>
<p>To process this file, call pandoc with filter <code>pwcite</code> followed by filter <code>pandoc-citeproc</code>:</p>
<pre><code>$ pandoc -F pwcite -F pandoc-citeproc example.md</code></pre>
<p>The first filter detects referenced Wikidata items, downloads the corresponding bibliographic records from Wikidata, and adds them to the document. The second filter creates nicely formatted references using the <a href="https://citationstyles.org/">Citation Style Language (CSL)</a>.</p>
<p>A local <a href="#bibliography-files">bibliography file</a> can be specified in metadata field <code>bibliography</code> for caching:</p>
<pre><code>---
citekeys:
Vrand04: Q18507561
bibliography: refs.json
...
Wikidata is a collaborative knowledge base [@Vrand04].</code></pre>
<p>If multiple bibliography files are specified then all are used for referencing but only the first file with extension <code>.json</code> is to store records fetched from Wikidata. This way it is possible to get some references from Wikidata and use other sources as well for instance BibTeX files.</p>
<p>Pandoc option <code>--bibliography</code> overrides an existing metadata field and automatically enables filter <code>pandoc-citeproc</code> but in this case the file must exist in advance.</p>
<h2 id="linking-bibliography-entries-to-wikidata">Linking bibliography entries to Wikidata</h2>
<p>Each bibliography entry in HTML format includes the Wikidata item identifier in its <code>id</code> attribute (e.g. <code><div id="ref-Q55239420">...</code>). This identifier can be used to add a link to the corresponding Wikidata item or to other services such as <a href="https://tools.wmflabs.org/scholia/">Scholia</a>. The filter <a href="#filter-pwcite">pwcite</a> can inject snippets of JavaScript and CSS to add links from bibliography entries to Wikidata. To to do set document metadata field <code>link-wikidata-references</code> to <code>true</code> or to an URL prefix (e.g. <code>https://tools.wmflabs.org/scholia/work/</code>). This feature is based on Pandoc metadata variable <code>include-after</code>, so don’t set it via Pandoc command line option <code>-A/--include-after-body</code> and don’t remove the variable in custom HTML templates!</p>
<h2 id="bibliography-files">Bibliography files</h2>
<p>Bibliographic records fetched from Wikidata should be stored locally for several reasons:</p>
<ul>
<li>performance: network access is slow</li>
<li>reproducibility: the data could have been been changed on Wikidata</li>
</ul>
<p>Both <a href="#command-wcite">wcite</a> and <a href="#filter-pwcite">pwcite</a> store records in a normalized CSL JSON file. Records in this file are sorted by Wikidata item identifier and serialized as pretty-printed JSON with sorted keys to facilitate comparing changes.</p>
<p>Bibliography files must have file extension <code>.json</code>. A file can be specified:</p>
<ul>
<li>via document metadata field <code>bibliography</code> (see example at <a href="#filter-pwcite">pwcite</a>)</li>
<li>as command line argument to <a href="#command-wcite">wcite</a></li>
<li>as existing file <code>wcite.json</code> (<em>not implemented yet</em>)</li>
</ul>
<p>Both <a href="#command-wcite">wcite</a> and <a href="#filter-pwcite">pwcite</a> use bibliography files for caching: records are first looked up by their Wikidata item identifier in the file and queried from Wikidata only if not found locally. Use <a href="#command-wcite">wcite</a> to delete or update records if needed.</p>
<h2 id="api">API</h2>
<p>The JavaScript API to use this package as module is not finished yet. Stable parts include:</p>
<h3 id="bibliography">Bibliography</h3>
<p>This class implements a <a href="#bibliography-files">bibliography file</a> that stores CSL JSON records from Wikidata.</p>
<div class="sourceCode" id="cb12"><pre class="sourceCode js"><code class="sourceCode javascript"><a class="sourceLine" id="cb12-1" title="1"><span class="kw">const</span> <span class="op">{</span> Bibliography <span class="op">}</span> <span class="op">=</span> <span class="at">require</span>(<span class="st">'wcite'</span>)</a>
<a class="sourceLine" id="cb12-2" title="2"></a>
<a class="sourceLine" id="cb12-3" title="3"><span class="kw">var</span> refs <span class="op">=</span> <span class="kw">new</span> <span class="at">Bibliography</span>(<span class="st">'refs.json'</span>)</a>
<a class="sourceLine" id="cb12-4" title="4"></a>
<a class="sourceLine" id="cb12-5" title="5"><span class="va">refs</span>.<span class="at">add</span>(item)</a>
<a class="sourceLine" id="cb12-6" title="6"><span class="kw">let</span> record <span class="op">=</span> <span class="va">refs</span>.<span class="at">get</span>(id<span class="op">,</span> citekeys) </a>
<a class="sourceLine" id="cb12-7" title="7"></a>
<a class="sourceLine" id="cb12-8" title="8"><span class="cf">if</span> (<span class="va">refs</span>.<span class="at">modified</span>) <span class="op">{</span></a>
<a class="sourceLine" id="cb12-9" title="9"> <span class="va">refs</span>.<span class="at">save</span>()</a>
<a class="sourceLine" id="cb12-10" title="10"><span class="op">}</span></a></code></pre></div>
<h3 id="wcite-1">wcite</h3>
<p>Provides the implementation of command [wcite-cli]</p>
<div class="sourceCode" id="cb13"><pre class="sourceCode js"><code class="sourceCode javascript"><a class="sourceLine" id="cb13-1" title="1"><span class="kw">const</span> <span class="op">{</span> wcite <span class="op">}</span> <span class="op">=</span> <span class="at">require</span>(<span class="st">'wcite'</span>)</a>
<a class="sourceLine" id="cb13-2" title="2"></a>
<a class="sourceLine" id="cb13-3" title="3"><span class="at">wcite</span>(<span class="op">{</span> <span class="dt">bibliography</span><span class="op">:</span> <span class="st">'refs.json'</span> <span class="op">}</span>).<span class="at">list</span>()</a></code></pre></div>
<h2 id="license">License</h2>
<p>MIT license</p>
<p>Contains parts of <a href="https://github.com/mvhenderson/pandoc-filter-node">pandoc-filter-node</a> originally created by Mike Henderson.</p>
<h2 id="acknowledgements">Acknowledgements</h2>
<p>Fetching and converting data from Wikidata and to BibTeX is implemented with <a href="https://citation.js.org/">citation.js</a> created by Lars Willighagen.</p>
<h2 id="references">References</h2>
<p>A bibliography of some publications relevant to wcite is included in the source code repository following here for the purpose of demonstration at <a href="http://wikicite.org/wcite/#references" class="uri">http://wikicite.org/wcite/#references</a>.</p>
<p>The locally stored CSL JSON file is available as <a href="references.json"><code>references.json</code></a>.</p>
<p>The benefits of having bibliographic data in a knowledge base are best illustrated by the <a href="https://tools.wmflabs.org/scholia/">Scholia</a> frontend to Wikidata: this website can be used to explore research publications and their connections to authors, institutions, places and other enties <span class="citation" data-cites="Q58484849">(Mietchen, Nielsen, and Willighagen 2018)</span>.</p>
<div id="refs" class="references">
<div id="ref-Q824708">
<p><em>Citation Style Language</em> (version 1.0.1). n.d.</p>
</div>
<div id="ref-Q58484849">
<p>Mietchen, Daniel, Finn Årup Nielsen, and Egon Willighagen. 2018. <em>WikiCite and Scholia - a Linked Open Data Approach to Exploring the Scholarly Literature and Related Resources</em>. <a href="https://commons.wikimedia.org/wiki/File:ScidataCon_2018_poster_168_-_WikiCite_and_Scholia_-_a_Linked_Open_Data_approach_to_exploring_the_scholarly_literature_and_related_resources.pdf">https://commons.wikimedia.org/wiki/File:ScidataCon_2018_poster_168_-_WikiCite_and_Scholia_-_a_Linked_Open_Data_approach_to_exploring_the_scholarly_literature_and_related_resources.pdf</a>.</p>
</div>
<div id="ref-Q2049294">
<p><em>Pandoc</em> (version 2.6). n.d.</p>
</div>
<div id="ref-Q55239420">
<p>Shelley, Mary. 1818. <em>Frankenstein</em>. 1st ed. London.</p>
</div>
<div id="ref-Q27044176">
<p>Voss, Jakob. 2016. <em>Wikidata Als Universalbibliographie: Ein Kommentar</em>. <em>LIBREAS</em>. doi:<a href="https://doi.org/10.18452/9090">10.18452/9090</a>.</p>
</div>
<div id="ref-Q18507561">
<p>Vrandečić, Denny, and Markus Krötzsch. 2014. “Wikidata: A Free Collaborative Knowledgebase.” <em>Communications of the ACM</em> 57 (10): 78–85. doi:<a href="https://doi.org/10.1145/2629489">10.1145/2629489</a>.</p>
</div>
</div>
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const base = 'http://www.wikidata.org/entity/'
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.forEach(div => {
var qid = div.id.substr(4)
var a = document.createElement('a')
a.className = 'wikidata-link'
a.href = base + qid
var p = div.firstElementChild
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})
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