code: public final static void appendHexEntity(final StringBuilder out, final char value)
      {
          out.append("&#x");
          out.append(Integer.toHexString(value));
          out.append(';');
      }
docs: Append the given char as a hexadecimal HTML entity.
  
  @param out
  The StringBuilder to write to.
  @param value
  The character.