3.12.4 <refsyn>

The <refsyn> element is a special section inside a reference topic. The section often contains syntax or signature content (for example, the calling syntax for a command-line utility or an API signature). The <refsyn> contains a brief, possibly diagrammatic description of the subject's interface or high-level structure.

<reference id="MyAPI">
  <title>MyAPI</title>
  <refbody>
    <refsyn>Describe the MyAPI syntax here, possibly
using synph or syntax elements markup for explicit 
definition of syntax or prototype construction.</refsyn>
  </refbody>
</reference>