al="true">
    <p>
      An enumeration of the types of parameters.
    </p>
    <enum>
      <value>
        <code>OPTIONAL_NAMED</code>
        <p>
          An optional named parameter.
        </p>
      </value>
      <value>
        <code>OPTIONAL_POSITIONAL</code>
        <p>
          An optional positional parameter.
        </p>
      </value>
      <value>
        <code>REQUIRED_NAMED</code>
        <p>
          A required named parameter.
        </p>
      </value>
      <value>
        <code>