diff --git a/.gitignore b/.gitignore
index 1540b2e..35cb993 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 feeds
 feeds.opml
+feeds.ocs
 feeds.cdf
 index.html
 *~
diff --git a/feedgen.sh b/feedgen.sh
index e897620..8ec1d86 100755
--- a/feedgen.sh
+++ b/feedgen.sh
@@ -8,6 +8,7 @@ xsltproc "$DIR/xslt/itsb.xsl" "$DIR/itsb.xml" > "$tmpfile"
 
 xsltproc "$DIR/xslt/feedgen.xsl" "$tmpfile" | DIR="$DIR" bash -s -- "$@"
 xsltproc "$DIR/xslt/opml.xsl" "$tmpfile" > "$DIR/feeds.opml"
+xsltproc "$DIR/xslt/ocs.xsl" "$tmpfile" > "$DIR/feeds.ocs"
 xsltproc "$DIR/xslt/html.xsl" "$tmpfile" > "$DIR/index.html"
 
 "$DIR/bin/cdfmerge" < "$tmpfile"
diff --git a/img/ocs.gif b/img/ocs.gif
new file mode 100644
index 0000000..1deb0a1
Binary files /dev/null and b/img/ocs.gif differ
diff --git a/itsb.xml b/itsb.xml
index cdeca9e..31e36ff 100644
--- a/itsb.xml
+++ b/itsb.xml
@@ -16,6 +16,7 @@
       <p>
         you can get all the feeds at once:
         <a href="./feeds.opml" target="_blank"><img src="img/opml.gif" alt="OPML" /></a>
+        <a href="./feeds.ocs" target="_blank"><img src="img/ocs.gif" alt="OCS" /></a>
         <a href="./feeds.cdf" target="_blank"><img src="img/cdf.gif" alt="CDF" /></a>
       </p>
       ]]>
diff --git a/xslt/ocs.xsl b/xslt/ocs.xsl
new file mode 100644
index 0000000..a210c52
--- /dev/null
+++ b/xslt/ocs.xsl
@@ -0,0 +1,148 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xsl:stylesheet
+  version="1.0"
+  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:itsb="http://tilde.town/~lucidiot/itsb/itsb.xsd"
+  xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+  xmlns:dc="http://purl.org/dc/elements/1.1/"
+  xmlns:ocs="http://InternetAlchemy.org/ocs/directory#"
+>
+  <xsl:output method="xml" indent="yes"/>
+  <xsl:param name="itsbRootUrl" select="'https://tilde.town/~lucidiot/itsb/'" />
+  
+  <xsl:template match="/">
+    <rdf:RDF>
+      <xsl:apply-templates select=".//itsb:source" />
+    </rdf:RDF>
+  </xsl:template>
+
+  <xsl:template match="itsb:source">
+    <rdf:description about="{./itsb:url/text()}">
+      <xsl:apply-templates select="itsb:name | itsb:description | itsb:type | itsb:region | itsb:license | itsb:feed" />
+    </rdf:description>
+  </xsl:template>
+
+  <xsl:template match="itsb:name">
+    <dc:title>
+      <xsl:value-of select="text()" />
+    </dc:title>
+  </xsl:template>
+
+  <xsl:template match="itsb:description">
+    <dc:description>
+      <xsl:value-of select="text()" />
+    </dc:description>
+  </xsl:template>
+
+  <xsl:template match="itsb:type">
+    <dc:subject>
+      <xsl:value-of select="text()" />
+    </dc:subject>
+  </xsl:template>
+
+  <xsl:template match="itsb:region">
+    <dc:coverage>
+      <xsl:value-of select="text()" />
+    </dc:coverage>
+  </xsl:template>
+
+  <xsl:template match="itsb:license">
+    <dc:rights>
+      <xsl:value-of select="text()" />
+    </dc:rights>
+  </xsl:template>
+
+  <xsl:template match="itsb:feed">
+    <rdf:description>
+      <xsl:choose>
+        <xsl:when test="itsb:link">
+          <xsl:attribute name="about">
+            <xsl:value-of select="itsb:link/text()" />
+          </xsl:attribute>
+          <dc:publisher>
+            <xsl:value-of select="ancestor::itsb:source/itsb:name/text()" />
+          </dc:publisher>
+        </xsl:when>
+        <xsl:otherwise>
+          <xsl:attribute name="about">
+            <xsl:value-of select="$itsbRootUrl" />
+            <xsl:text>feeds/</xsl:text>
+            <xsl:value-of select="itsb:output/text()" />
+          </xsl:attribute>
+          <dc:publisher>International Transport Safety Bureau</dc:publisher>
+          <ocs:updatePeriod>daily</ocs:updatePeriod>
+          <ocs:updateFrequency>1</ocs:updateFrequency>
+          <ocs:updateBase>1970-01-01T14:00</ocs:updateBase>
+        </xsl:otherwise>
+      </xsl:choose>
+ 
+      <xsl:if test="@type">
+        <dc:subject>
+          <xsl:value-of select="@type" />
+        </dc:subject>
+      </xsl:if>
+      <!-- TODO: Add dc:language - might require updating itsb.xsd to require ISO language codes -->
+ 
+      <ocs:format>
+        <xsl:choose>
+          <xsl:when test="@format = 'atom'">
+            <xsl:text>http://www.w3.org/2005/Atom</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'cdf'">
+            <xsl:text>https://msdn.microsoft.com/workshop/standards/cdf/</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'echo'">
+            <xsl:text>http://purl.org/echo/</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'json'">
+            <xsl:text>https://www.jsonfeed.org/version/1.1/</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'rdf'">
+            <xsl:text>https://web.resource.org/rss/1.0/spec</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'rss'">
+            <xsl:text>https://www.rssboard.org/rss-2-0-1</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'rss3'">
+            <xsl:text>http://www.aaronsw.com/2002/rss30</xsl:text>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:message terminate="yes">
+              <xsl:text>Unsupported feed format: </xsl:text>
+              <xsl:value-of select="@format" />
+            </xsl:message>
+          </xsl:otherwise>
+        </xsl:choose>
+      </ocs:format>
+ 
+      <ocs:contentType>
+        <xsl:choose>
+          <xsl:when test="@format = 'atom'">
+            <xsl:text>application/atom+xml</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'cdf' or @format = 'echo'">
+            <xsl:text>application/xml</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'json'">
+            <xsl:text>application/json</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'rdf'">
+            <xsl:text>application/rdf+xml</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'rss'">
+            <xsl:text>application/rss+xml</xsl:text>
+          </xsl:when>
+          <xsl:when test="@format = 'rss3'">
+            <xsl:text>text/plain</xsl:text>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:message terminate="yes">
+              <xsl:text>Unsupported feed format: </xsl:text>
+              <xsl:value-of select="@format" />
+            </xsl:message>
+          </xsl:otherwise>
+        </xsl:choose>
+      </ocs:contentType>
+    </rdf:description>
+  </xsl:template>
+</xsl:stylesheet>