s referring to the input. Given a skip-parser type <tt>SkipT</tt>, 
  <span class=identifier><tt>skip_parser_iteration_policy</tt></span> creates 
  a scanner iteration policy that skips over portions that are recognized by the 
  skip-parser. This may then be used to create a scanner. The <tt>scanner_policies</tt> 
  class wraps all scanner related policies including the iteration policies.</p>
<h2><a name="lexeme_scanner"></a>lexeme_scanner</h2>
<p>When switching from phrase level to character level parsi