ISO 639-5:2008提供了一种由语言代码元素组成的代码，其中包含三个字母的语言标识符，用于表示现存和灭绝的语系和语族的名称。本代码中不包括专门为机器使用而设计的语言，如计算机编程语言。

ISO 639-5:2008 provides a code consisting of language code elements comprising three-letter language identifiers for the representation of names of living and extinct language families and groups. Languages designed exclusively for machine use, such as computer-programming languages, are not included in this code.