之所以定义前缀，是因为URI和URL非常难用。

We use the prefixes because URIs and URLs can be pretty unwieldy.

youdao

注意设置一个名称空间的上下文不会写出名称空间声明——它仅定义前缀绑定。

Note that setting a namespace context does not cause the namespace declarations to be written out — it just defines the prefix bindings.

youdao

定义开丛为串空间图的构造单元，并在开丛集上定义前缀算子和组合算子。

And the two operators such as prefixing and parallel composition over the set of open bundles are defined.

youdao