code: function amf0encXmlDoc(str) { // Essentially it is the same as string
      var buf = new Buffer(3);
      buf.writeUInt8(0x0F, 0);
      buf.writeUInt16BE(str.length, 1);
      return Buffer.concat([buf, new Buffer(str, 'utf8')]);
  }
docs: AMF0 Encode XMLDoc
  @param str
  @returns {Buffer}