title: Is there a property named "rowgroup" like "colgroup" in XHTML?
body: <p>The following <code>w3c</code> documents mentions <code>rowgroup</code></p>
  
  <ul>
  <li><a href="http://www.w3.org/TR/html401/struct/tables.html#h-11.2.6" rel="noreferrer">http://www.w3.org/TR/html401/struct/tables.html#h-11.2.6</a></li>
  <li><a href="http://www.w3.org/TR/html401/struct/tables.html#rowgroups" rel="noreferrer">http://www.w3.org/TR/html401/struct/tables.html#rowgroups</a></li>
  </ul>
  
  <blockquote>
    <p><code>&lt;!ENTITY % Scope "(row|col|rowgroup|colgroup)"&gt;</code></p>
  </blockquote>
  
  <p>Is there such an attribute or property?</p>