update-site/site.xml

<?xml version="1.0" encoding="UTF-8"?>
<site>
   <description name="protobuf-dt" url="http://protobuf-dt.googlecode.com/git/update-site">
      Update site for protobuf-dt, an Eclipse-based Development Environment for Protocol Buffers.
   </description>
   <feature url="features/com.google.eclipse.protobuf_1.4.1.201306170929.jar" id="com.google.eclipse.protobuf" version="1.4.1.201306170929">
      <category name="google"/>
   </feature>
   <feature url="features/com.google.eclipse.protobuf_1.4.3.201307151341.jar" id="com.google.eclipse.protobuf" version="1.4.3.201307151341">
      <category name="google"/>
   </feature>
   <feature url="features/com.google.eclipse.protobuf_2.1.0.201412161507.jar" id="com.google.eclipse.protobuf" version="2.1.0.201412161507">
      <category name="google"/>
   </feature>
   <feature url="features/com.google.eclipse.protobuf_2.2.0.201512281705.jar" id="com.google.eclipse.protobuf" version="2.2.0.201512281705">
      <category name="google"/>
   </feature>
   <feature url="features/com.google.eclipse.protobuf_2.2.1.201601041517.jar" id="com.google.eclipse.protobuf" version="2.2.1.201601041517">
      <category name="google"/>
   </feature>
   <category-def name="google" label="Google Inc."/>
</site>