true</span></code>
          or <code class="computeroutput"><span class="keyword">false</span></code> depending on the
          result of the output generation. As outlined in different places of this
          documentation, a generator may fail for different reasons. One of the possible
          reasons is an error in the underlying output iterator (memory exhausted
          or disk full, etc.). Another reason might be that the data doesn't match
          the requirements of a particular generator.
 