title: Tag unknown s:property
body: <p>I'm coding with Eclipse. I have two lines in my code with a warning mark.</p>
  <p>This warnings are :</p>
  <pre><code>unknown tag (s:property).
  </code></pre>
  <p>The two lines of code are below :</p>
  <pre><code>username : &lt;s:property value=&quot;username&quot; /&gt;&lt;br/&gt;
  password : &lt;s:property value=&quot;password&quot; /&gt;&lt;br/&gt;
  </code></pre>
  <p>I don't understand, what's wrong? Is there someone to explain me what could be the problem ?</p>