scope:

Foreword

ISO (the lnternational Organization for Standardization) and IEC (the lnternational Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of IS0 or IEC participate in the development of lnternational Standards through technical committees established by the respective organization to deal with particular fields of technical activity. IS0 and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with IS0 and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.

lnternational Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of the joint technical committee is to prepare lnternational Standards. Draft lnternational Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an lnternational Standard requires approval by at least 75 % of the national bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.

Amendment I to ISO/IEC 14443-4:2001 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 17, Cards and personal identification.

As part of maintaining ISO/IEC 14443-4:2001, a need was raised to better clarify the handling of fields and values reserved by ISO/IEC for future use. This Amendment addresses the required document enhancements.

ISO/IEC 14443-4:2001 defines certain fields and values as Reserved for Future Use (RFU) by new ISO/IEC rules that may be added in later versions. This Amendment includes clarification that products in conformity with ISO/IEC 14443-4:2001 shall not improperly use RFU fields and values, plus documentation of product behaviour that, when followed by PlCC and PCD designs commenced after publication of ISO/IEC 14443-4:2001, should assist with backward compatibility and interoperability for future definition by ISO of RFU fields and values. Consequently, many of the references to "should" may be changed into a definitive "shall" in the second edition of ISO/IEC 14443-4:2001; thus, it is recommended to implement them at this time.