rssd_q.html is a HTML file within leaf Atom file, rssd_opq.atom. 
rssd_root.atom (1st level directory)
  + rssd_abc.atom (2nd level directory)
  |   + rssd_a.atom (Leaf Atom file)
  |   + rssd_b.atom
  |   + rssd_c.atom
  + rssd_hij.atom (2nd level directory)
  |   + rssd_h.atom (Leaf Atom file)
  |   + rssd_i.atom
  |   + rssd_j.atom
  + rssd_opq.atom (Leaf Atom file)
      + rssd_o.html
      + rssd_p.html
      + rssd_q.html