Doc 9303第七版代表了国际民航组织机器可读旅行规范的重组 文件。在没有对规范进行实质性修改的情况下，新版Doc 9303已重新格式化为一号机读公务旅行证件（TD1）、二号机读公务旅行证件（TD2）和三号机读旅行证件（TD3）以及签证的一套规范。这套规范由各种单独的文件组成，其中包括通用规范（适用于所有MRTD）和MRTD形状系数特定规范。 Doc 9303第4部分以Doc 9303第6版第1部分机器可读护照卷为基础。1. (2006). Doc 9303，第4部分定义了特定于TD3大小机器可读护照（MRP）和其他TD3大小机器可读旅行证件（MRTDs）的规范。为简洁起见，本文件中使用了术语MRP，除另有说明外，本文件中的所有规范应同样适用于所有其他TD3尺寸的MRTD。

The Seventh Edition of Doc 9303 represents a restructuring of the ICAO specifications for Machine Readable Travel Documents. Without incorporating substantial modifications to the specifications, in this new edition Doc 9303 has been reformatted into a set of specifications for Size 1 Machine Readable Official Travel Documents (TD1), Size 2 Machine Readable Official Travel Documents (TD2), and Size 3 Machine Readable Travel Documents (TD3), as well as visas.This set of specifications consists of various separate documents in which general (applicable to all MRTDs) as well as MRTD form factor specific specifications are grouped.This Part 4 of Doc 9303 is based on the Sixth Edition of Doc 9303, Part 1, Machine Readable Passports, Volume.1 (2006). Doc 9303, Part 4 defines specifications that are specific to TD3 size Machine Readable Passports (MRPs) and other TD3 size Machine Readable Travel Documents (MRTDs). For brevity the term MRP has been used throughout this document and, except where stated, all the specifications herein shall apply equally to all other TD3 size MRTDs.