       times. No upper limit for the repeat count is set. This generator
                      succeeds as long as its embedded generator <code class="computeroutput"><span class="identifier">a</span></code>
                      does not fail and as long as the associated attribute (container)
                      contains at least <code class="computeroutput"><span class="identifier">num</span></code>
                      elements (unless the underlying output stream reports an error).
                 