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    Are there any reserved words that should not be allowed in token names?
  </div></div>

  </section></section><section id="additional-properties"><div class="header-wrapper"><h3 id="x5-2-additional-properties"><bdi class="secno">5.2 </bdi>Additional properties</h3><a class="self-link" href="#additional-properties" aria-label="Permalink for Section 5.2"></a></div>
  <p>While “value” is the only required property for a token, a number of additional properties may be added:</p>
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