This is due to the nature of the UML tools: Most UML tools implement a subset of UML and render UML diagrams their own way using tool-specific styles, profiles etc.

这是由 UML 工具的天性决定的：大多数 UML 工具执行的是 UML 的一个子集，并且以它们自己所使用的特定工具风格、规范等呈递 UML 图表。

youdao

From the outset, the designers of UML recognized that UML would have applications that they had not anticipated, so they implemented extension mechanisms that allow users to improve UML.

从一开始，UML的设计者就认识到UML可能会被用于没有预料到的用途，因此实现了扩展机制，以允许用户改进U ML。

youdao

A good option is uml-in particular, UML class diagrams-because UML concepts map easily onto NIEM model concepts.

一个好的选择是UML—特别是UM l类图表—因为UML概念可以轻松映射到NIEM模型概念。

youdao

But despite weeks of negotiations, the three main political parties - the Maoists,the Nepali Congress, and the Communist Party known as UML have failed to reach a consensus on who should head a new government.

VOA: standard.2010.07.29

The NC and the UML have appealed to him not to endorse the election date.

ECONOMIST: Gridlock over a new constitution leaves a power vacuum

The UML and NC both expected to win the country's first post-war election last year.

ECONOMIST: The peace process still on life-support

But General Katawal, egged on by the NC, UML and India, has resisted this.

ECONOMIST: The peace process still on life-support