td><code>RDFLiteral</code></td>
      <td>::=</td>
      <td><a href="#tg-grammar-production-String">String</a> <code>(</code> <a href="#tg-grammar-production-LANGTAG">LANGTAG</a> <code>|</code> <code>(</code> &quot;^^&quot; <a href="#tg-grammar-production-iri">iri</a><code>)</code> <code>)</code> <code>?</code> </td>
    </tr>
    <tr id="tg-grammar-production-BooleanLiteral">
      <td>[133s]</td>
      <td><code>BooleanLiteral</code></td>
      <td>::=</td>
      <td>&quot;true&quot; <code>|</code> &quot