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2016-09-11 21:53:06 -04:00
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<div id="siteSub">From XOWA: the free, open-source, offline wiki application</div>
<div id="contentSub"></div>
<div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr">
<div id="catlinks" class="catlinks">
<div id="mw-normal-catlinks" class="mw-normal-catlinks">
Categories
<ul>
</ul>
</div>
</div>
<p>
XOWA stores wiki data in SQLite databases. These databases can be classified as either Wikitext or HTML
</p>
<div id="toc" class="toc">
<div id="toctitle">
<h2>
Contents
</h2>
</div>
<ul>
<li class="toclevel-1 tocsection-1">
<a href="#SQLite"><span class="tocnumber">1</span> <span class="toctext">SQLite</span></a>
</li>
<li class="toclevel-1 tocsection-2">
<a href="#XOWA_Database_sets:_Wikitext_vs_HTML"><span class="tocnumber">2</span> <span class="toctext">XOWA Database sets: Wikitext vs HTML</span></a>
<ul>
<li class="toclevel-2 tocsection-3">
<a href="#Wikitext"><span class="tocnumber">2.1</span> <span class="toctext">Wikitext</span></a>
</li>
<li class="toclevel-2 tocsection-4">
<a href="#HTML"><span class="tocnumber">2.2</span> <span class="toctext">HTML</span></a>
</li>
</ul>
</li>
</ul>
</div>
<h2>
<span class="mw-headline" id="SQLite">SQLite</span>
</h2>
<p>
XOWA uses SQLite database files to store its data.
</p>
<ul>
<li>
Files have an extension of either ".xowa" or ".sqlite3". Note that ".xowa" files are just plain old sqlite3 databases with a renamed extension.
</li>
<li>
Files are limited to 2 GB. Note that SQLite can easily handle files greater than 100 GB. The 2 GB limit is imposed for the following two constraints:
<ul>
<li>
<b>2 GB limit for SQLite files on Android</b>. I've not found any documentation that states this, but opening a file larger than 2 GB file always fails.
</li>
<li>
<b>4 GB limit for FAT32 on flash cards</b>. FAT32 is an old file-system format. However, it is the only format that is supported natively by all major operating systems. I install a set of wikis on a 200 GB FAT32-formatted microSD card and carry it around from machine to machine
</li>
</ul>
</li>
</ul>
<p>
Various programs can be used to read SQLite3.
</p>
<ul>
<li>
<b>sqlite3 command shell</b>: This is the official shell for SQLite. Instructions are available here: the <a href="https://www.sqlite.org/cli.html" rel="nofollow" class="external free">https://www.sqlite.org/cli.html</a> . Download is available here: <a href="https://www.sqlite.org/download.html" rel="nofollow" class="external free">https://www.sqlite.org/download.html</a>
</li>
<li>
<b>SQLite browser</b>. This is a free, open-source GUI that can be useful for those who don't want just a command-line shell. See: <a href="http://sqlitebrowser.org/" rel="nofollow" class="external free">http://sqlitebrowser.org/</a>
</li>
</ul>
<h2>
<span class="mw-headline" id="XOWA_Database_sets:_Wikitext_vs_HTML">XOWA Database sets: Wikitext vs HTML</span>
</h2>
<p>
There are two types of database sets for XOWA: Wikitext and HTML
</p>
<h3>
<span class="mw-headline" id="Wikitext">Wikitext</span>
</h3>
<ul>
<li>
Wikitext is a custom language by MediaWiki to generate HTML. For example, two apostrophes are used for italics: <code>''italics''</code>
</li>
<li>
Wikitext databases will have <code>-text-</code> in the file name. For example, <code>en.wikipedia.org-text-ns.000.xowa</code>
</li>
<li>
Users can generates this Wikitext set by using either <a href="http://xowa.org/home/wiki/Dashboard/Import/Online.html" id="xolnki_2" title="Dashboard/Import/Online" class="xowa-visited">Dashboard/Import/Online</a> or <a href="http://xowa.org/home/wiki/Dashboard/Import/Offline.html" id="xolnki_3" title="Dashboard/Import/Offline" class="xowa-visited">Dashboard/Import/Offline</a>
</li>
<li>
Wikitext databases have been supported since the very start of XOWA. As such, they have a full set of functionality
</li>
<li>
However, Wikitext databases are slower. They need to take the Wikitext and convert it to HTML. As such, Wikitext databases don't work for Android, nor for other low-spec machines like Raspberry Pi
</li>
</ul>
<h3>
<span class="mw-headline" id="HTML">HTML</span>
</h3>
<ul>
<li>
HTML is the raw text as used by a web browser. For example, the following is used for italics: <code>&lt;i&gt;italics&lt;/i&gt;</code>
</li>
<li>
HTML databases will have <code>-html-</code> in the file name. For example, <code>en.wikipedia.org-html.xowa</code>
</li>
<li>
Users can generate this HTML database using <a href="http://xowa.org/home/wiki/Dev/Command-line/Thumbs.html" id="xolnki_4" title="Dev/Command-line/Thumbs">Dev/Command-line/Thumbs</a>. However, for most users, they will just download the already-generated HTML databases from <a href="http://archive.org" rel="nofollow" class="external free">http://archive.org</a> through <a href="http://xowa.org/home/wiki/Special:XowaDownloadCentral.html" id="xolnki_5" title="Special:XowaDownloadCentral" class="xowa-visited">Special:XowaDownloadCentral</a>
</li>
<li>
HTML databases have only been supported recently (as of 2016-06). As such, they are missing a small percentage of functionality. The most significant piece of that functionality is Popups, but there may be other features.
</li>
<li>
HTML databases are fast, as they don't need to convert Wikitext to HTML. As such, HTML databases are used for Android and recommended for Raspberry Pi
</li>
</ul>
</div>
</div>
</div>