span class='id identifier rubyid_action'>action</span><span class='embexpr_end'>}</span><span class='tstring_end'>&quot;</span></span> <span class='kw'>unless</span> <span class='id identifier rubyid_action'>action</span><span class='period'>.</span><span class='id identifier rubyid_is_a?'>is_a?</span> <span class='const'><span class='object_link'><a href="Action.html" title="Zif::Actions::Action (class)">Action</a></span></span>
  <span class='kw'>end</span>

  <span class='ivar'>@callback</span> <span cla