code: public static void enc(char[] in, int start, int length, StringBuffer out) {
          for (int i = start; i < length + start; i++) {
              enc(in[i], out);
          }
      }
docs: Prints an XML-appropriate encoding of the given range of characters to
  the given Writer.
  
  @param in
  The char buffer to read from.
  @param start
  The starting index.
  @param length
  The number of characters in the range.
  @param out
  The Appendable to write to.