技术规范的这一部分将ID标签的表示定义为打印在项目背面的区域R1中的荧光墨水中的78位无条形码（BNB-78）。 BIA-78编码是本技术规范支持的两种编码规范之一）用于在区域R1中打印ID标签，另一种是在CEN/TS 15844-3中指定的BNB-62。 注1:打印在项目前面的4状态代码的表示在CEN/TS 15844-4中有关单位和CEN/TS 15844-5的小写字母。 BNB-78编码取代了早先指定的BNB-62编码，并且应在所有情况下应用ID标签放置在大小达到并包括C5的字母邮件项目的反面的区域R1中，除了那些以外的发行者明确授权继续使用BNB-62编码，即安邮（爱尔兰），加拿大邮政和美国邮政。 注2:在区域R1中编码的ID标签是由UPU信函规则[1]的第RL条123要求符合UPU标准S18而由相关CEN/TS 15844支持的。这仅支持两个编码区域R1，即本文定义的BNB-78和CEN/TS 15844-3中定义的BNB-62。后者被授权仅由三家发行人继续使用

This part of the Technical Specification defines the representation of ID-tags as a 78-position bar-no-bar code (BNB-78) printed in fluorescent ink in area R1 on the reverse side of items. BNB-78 encoding is one of two encoding specifications supported by this Technical Specification ) for the printing of ID-tags in area R1, the other being BNB-62, which is specified in CEN/TS 15844-3. NOTE 1 Representation in the form of a 4-state code printed on the front of the item is covered in CEN/TS 15844-4 for flats and CEN/TS 15844-5 for small letters. BNB-78 encoding supersedes the earlier specified BNB-62 encoding and shall be applied in all cases in which ID-tags are placed in area R1 on the reverse side of letter mail items of size up to and including C5, by issuers other than those explicitly authorised to continue use of BNB-62 encoding, namely An Post (Ireland), Canada Post and United States Postal Service. NOTE 2 ID-tags encoded in area R1 are required by article RL 123 of the UPU Letter Post Regulations [1] to be compliant with UPU standard S18 – and by this with the related CEN/TS 15844. This supports only two encodings in area R1, namely BNB-78 as defined herein and BNB-62 as defined in CEN/TS 15844-3. The latter is authorised for continued use only by the three issuers mentioned above. Where ID-tags are used, and are applied in area R1 on the reverse side of letter mail items of size up to and including C5, the use of BNB-78 encoding is mandatory for all other issuers. NOTE 3 BNB-78 encoding is not considered suitable for use on flats. CEN/TS 15844-4 defines a 4-state encoding which may be used for this purpose.