ode>.</p></li>
<li><p><code>key_value</code>: A character vector to identify key values of the data. If
<code>NULL</code>, all keys of that variable will be returned. <code>key_value</code> can also be
data.frame that contains <code>key_value</code> and <code>name</code> columns. In this case,
<code>name</code> argument in <code>$report_data()</code> is ignored. All available <code>key_value</code>
for current simulation output can be obtained using <code>$report_data_dict()</code>.
Default: <code>NULL</cod