>

  <section id="sotd">
  </section>

  <section id="introduction">
    <h2>Introduction</h2>
    <p>
      In the most basic sense, an "Activity" is a semantic description of
      an action. It is the goal of this specification to provide a JSON-based
      syntax that is sufficient to express metadata about activities in a rich,
      human-friendly but machine-processable and extensible manner.  This can
      include constructing natural-language descriptions or visual
      representations about the 