diff --git a/static/editors/oxygen/latest.xhtml b/static/editors/oxygen/latest.xhtml
new file mode 100644
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+++ b/static/editors/oxygen/latest.xhtml
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+<?xml version="1.0" encoding="UTF-8"?>
+<html xmlns="http://www.w3.org/1999/xhtml">
+	<head>
+		<title>XSpec</title>
+	</head>
+	<body>
+		<div>
+			<p>This add-on installs a recent snapshot of the <span style="color:red">development
+					version</span> of XSpec. See <a
+					href="https://github.com/xspec/xspec/wiki/Running-with-Oxygen">Wiki</a> for
+				details.</p>
+			<p>This add-on does <span style="color:red">not</span> work side by side with <b>XSpec
+					Framework</b> add-on (a companion add-on for <b>XSpec Helper view</b>
+				add-on).</p>
+		</div>
+		<div>
+			<h2 style="margin-top: 8mm">Changelog (not inclusive)</h2>
+			<div>
+				<h3>v3.2.0</h3>
+				<ul>
+					<li>Test reports use black text on white background by default, improving accessibility.
+						Themes 'whiteblack' (white on black) and 'classic' (earlier green/pink design) are
+						also available. (<a href="https://github.com/xspec/xspec/pull/1822">#2055</a>)</li>
+					<li>Tests for Schematron can verify string values of Schematron properties
+						(<a href="https://github.com/xspec/xspec/pull/1822">#2045</a>).</li>
+					<li>Tested with BaseX 11.6</li>
+					<li>Tested with Oxygen 27.0.</li>
+				</ul>
+			</div>
+			<div>
+				<h3>v3.1.3</h3>
+				<ul>
+					<li>Fix for <a href="https://github.com/xspec/xspec-maven-plugin-1/">xspec/xspec-maven-plugin-1</a> and other uses
+						of XSpec from a .zip or .jar file</li>
+					<li>SchXslt 1.10.1 replaces 1.10 as the built-in Schematron implementation</li>
+				</ul>
+			</div>
+			<div>
+				<h3>v3.1.2</h3>
+				<ul>
+					<li>Official release of v3.1</li>
+				</ul>
+			</div>
+			<div>
+				<h3>v3.1.1</h3>
+				<ul>
+					<li>Release Candidate of the stable release</li>
+					<li>fix(report): XSLT code coverage reports for Saxon 12.4 have many bug fixes in the coverage status</li>
+					<li>feat(schematron): SchXslt 1.10 replaces 1.9.5 as the built-in Schematron implementation</li>
+					<li>Tested with Saxon 10.9, 11.6, and 12.5, except that detailed contents of XSLT code coverage reports are tested with Saxon 12.4</li>
+					<li>Tested with Oxygen 26.1</li>
+					<li>Tested with BaseX 11.3</li>
+				</ul>
+			</div>
+			<div>
+				<h3>v3.0.3</h3>
+				<ul>
+					<li>Official release of v3.0</li>
+				</ul>
+			</div>
+			<div>
+				<h3>v3.0.2</h3>
+				<ul>
+					<li>Release Candidate of the stable release</li>
+					<li>feat(xslt): code coverage for Saxon 12.4+ (<a href="https://github.com/xspec/xspec/pull/1833"
+							>#1833</a>)</li>
+					<li>Removes Saxon 9.9 support</li>
+					<li>Saxon versions earlier than 12.4 are no longer recommended</li>
+					<li>Tested with Saxon 10.9, 11.6, and 12.4</li>
+					<li>Tested with Oxygen 26.1</li>
+				</ul>
+			</div>
+			<div>
+				<h3>v3.0.1</h3>
+				<ul>
+					<li>feat(schematron): SchXslt 1.9.5 replaces skeleton implementation</li>
+					<li>feat(schematron): verification of messages (<a href="https://github.com/xspec/xspec/pull/1822"
+							>#1822</a>)</li>
+					<li>feat: syntax to ignore some or all attributes (<a href="https://github.com/xspec/xspec/pull/1838"
+							>#1838</a>)</li>
+					<li>feat: experimental support for XSLT/XQuery/XPath 4.0 (<a href="https://github.com/xspec/xspec/pull/1883"
+							>#1883</a>)</li>
+				</ul>
+			</div>
+			<div>
+				<h3>v3.0.0</h3>
+				<ul>
+					<li>Initial development version of v3.0</li>
+					<li>Tested with Oxygen 26.0</li>
+				</ul>
+			</div>
+		</div>
+	</body>
+</html>
diff --git a/static/editors/oxygen/oxygen-addon.xml b/static/editors/oxygen/oxygen-addon.xml
new file mode 100644
index 0000000..a71c20a
--- /dev/null
+++ b/static/editors/oxygen/oxygen-addon.xml
@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xt:extensions xmlns:xi="http://www.w3.org/2001/XInclude"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns:xt="http://www.oxygenxml.com/ns/extension"
+	xsi:schemaLocation="http://www.oxygenxml.com/ns/extension http://www.oxygenxml.com/ns/extension/extensions.xsd">
+
+	<!-- This @id value assumes that https://github.com/xspec/ community owns "xspec.io". -->
+	<xt:extension id="io.xspec.xspec">
+
+		<!--
+			To publish a new version,
+			* Update this @href to a specific commit archive
+			* Increment <xt:version>
+			* Disable the new add-on version in the project options stored in xspec.xpr
+			  (Options - Preferences - Document Type Association)
+			* Update the changelog in xt:description
+		-->
+		<xt:location
+			href="https://github.com/xspec/xspec/archive/fee92fd453ac9e55e3c889df168ebc918fdc8485.zip" />
+
+		<xt:version>3.2.0</xt:version>
+
+		<!-- Note that supporting multiple oXygen versions may be hard to maintain, because
+			* oXygen add-on and framework require manual testing.
+			* oXygen framework cannot always be backward compatible. See
+			  https://github.com/TEIC/oxygen-tei/issues/30. -->
+		<xt:oxy_version>24.1+</xt:oxy_version>
+
+		<xt:type>framework</xt:type>
+
+		<!-- This could be Jeni, but she's not participated in this add-on release. -->
+		<xt:author>https://github.com/xspec/xspec</xt:author>
+
+		<xt:name>XSpec</xt:name>
+
+		<xt:description>
+			<xi:include href="latest.xhtml">
+				<xi:fallback>Visit https://github.com/xspec/xspec and see
+					editors/oxygen/add-on/description/latest.xhtml</xi:fallback>
+			</xi:include>
+		</xt:description>
+
+		<xt:license><![CDATA[
+			The MIT License
+
+Copyright (c) 2008-2017 Jeni Tennison
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+		]]></xt:license>
+
+	</xt:extension>
+
+</xt:extensions>
