ISO/IEC 8859由几个部分组成。每个部分指定一组多达191个图形字符和这些字符通过单个8位字节的编码表示。每个集合都用于特定的语言组。 ISO/IEC 8859-7:20 03规定了一组188个编码图形字符，标识为拉丁/希腊字母。这组编码图形字符旨在用于数据和文本处理应用以及信息交换。该集合包含用于典型办公环境中通用应用程序的至少以下语言的图形字符:英语、希腊语和拉丁语。 根据ISO/IEC 2022或ISO/IEC 4873的级别1，该组编码图形字符可以被视为8位代码的版本。ISO/IEC 8859-7:20 03不得与ISO/IEC 8859的任何其他部分一起使用。如果来自一个以上部分的编码字符将通过代码扩展技术一起使用，则应在ISO/IEC 4873的2级或3级版本中使用来自ISO/IEC 10367的等效编码字符集或来自ISO国际编码字符集寄存器的与转义序列一起使用的G1集。 该组中的编码字符可以与选自ISO/IEC 6429的编码控制功能结合使用。但是，控制功能不用于从两个或多个图形字符创建复合图形符号（参见第6条）。 注ISO/IEC 8859不适用于ITU-T定义的远程信息处理服务。如果根据ISO/IEC 8859编码的信息要被传送到这样的服务，它将必须在接入点符合那些服务的要求。

ISO/IEC 8859 consists of several parts. Each part specifies a set of up to 191 graphic characters and the coded representation of these characters by means of a single 8-bit byte. Each set is intended for use for a particular group of languages. ISO/IEC 8859-7:2003 specifies a set of 188 coded graphic characters identified as Latin/Greek alphabet. This set of coded graphic characters is intended for use in data and text processing applications and also for information interchange. The set contains graphic characters used for general purpose applications in typical office environments in at least the following languages: English, Greek, and Latin. This set of coded graphic characters may be regarded as a version of an 8-bit code according to ISO/IEC 2022 or ISO/IEC 4873 at level 1. ISO/IEC 8859-7:2003 may not be used in conjunction with any other parts of ISO/IEC 8859. If coded characters from more than one part are to be used together, by means of code extension techniques, the equivalent coded character sets from ISO/IEC 10367, or their corresponding G1 sets from the ISO International Register of Coded Character Sets to be Used with Escape Sequences, should be used instead within a version of ISO/IEC 4873 at level 2 or level 3. The coded characters in this set may be used in conjunction with coded control functions selected from ISO/IEC 6429. However, control functions are not used to create composite graphic symbols from two or more graphic characters (see Clause 6). NOTE ISO/IEC 8859 is not intended for use with Telematic services defined by ITU-T. If information coded according to ISO/IEC 8859 is to be transferred to such services, it will have to conform to the requirements of those services at the access-point.