     <span class='id identifier rubyid_styles'>styles</span>
  <span class='kw'>if</span> <span class='id identifier rubyid_book'>book</span><span class='period'>.</span><span class='id identifier rubyid_has_cover?'>has_cover?</span>
    <span class='id identifier rubyid_target'>target</span><span class='period'>.</span><span class='id identifier rubyid_compress_file'>compress_file</span> <span class='tstring'><span class='tstring_beg'>&#39;</span><span class='tstring_content'>OEBPS/cover.html</span><span c