当然，只能用数值引用位置的 API 作用是很有限的。

Of course, an API that only let you reference sites with numeric values would be pretty limited.

youdao

该例表明，BICS文档可以使用URL(可能是一个模式的位置)引用约束。

A BICS document can reference a constraint that USES a URL (perhaps the location of a schema) as in this example.

youdao

源代码中特定位置引用的符号。

The symbols referenced at a specific location in source.

youdao