code: public void xmlDeclaration(Map<String, Object> args) {
          Map<String, Map<String, Object>> map = new HashMap<String, Map<String, Object>>();
          map.put("xml", args);
          pi(map);
      }
docs: Produce an XML declaration in the output.
  For example:
  <pre>
  mkp.xmlDeclaration(version:'1.0')
  </pre>
  
  @param args the attributes for the declaration