ISO/IEC 19501:2004描述了统一建模语言（UML），一种用于可视化、指定、构造和记录软件密集型系统工件的图形语言。UML提供了一种编写系统蓝图的标准方法，包括业务流程和系统功能等概念性内容，以及编程语言语句、数据库模式和可重用软件组件等具体内容。

ISO/IEC 19501:2004 describes the Unified Modeling Language (UML), a graphical language for visualizing, specifying, constructing and documenting the artifacts of a software-intensive system. The UML offers a standard way to write a system's blueprints, including conceptual things such as business processes and system functions, as well as concrete things such as programming language statements, database schemas, and reusable software components.