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<p>
A convenience macro, <code>defsystem</code>, allows you to declare systems succinctly:
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<pre class="src src-clojure"><span style="color: #707183;">(</span><span style="color: #a020f0;">ns</span> <span style="color: #228b22;">my-app.systems</span>
  <span style="color: #7388d6;">(</span><span style="color: #008b8b;">:require</span>
   <span style="color: #909183;">[</span>system.core <span style="color: #008b8b;">:r