[defns.prog.def.spec] 中的`⟨library⟩` 是什么意思?

What does `⟨library⟩` mean in [defns.prog.def.spec]?

3.42 程序定义的特化 [defns.prog.def.spec]
⟨library⟩ 不属于 C++ 标准库且未由实现定义的显式模板特化或部分特化。

定义上下文标签(非规范/来自草案 .tex 来源)

移动[definitions] from [library] (C++20) into [intro.defs] (current draft). The ⟨library⟩ definition context tag in the particular change you are quoting was added when [defns.prog.def.spec] in [definitions] (C++20 DIS) was moved into [intro.defs] as part of the following commit

时添加了⟨library⟩定义上下文标签

[definitions] Integrate into [intro.defs]

Partially addresses ISO/CS 016 (C++20 DIS)

特别添加 \defncontext{library} 标签 here.

这些定义上下文标签已经在 [intro.defs] 中存在了很长时间,但是由于库定义过去并不驻留在 [intro.defs] 中,因此根本就没有任何定义⟨library⟩ 将是一个合适的定义上下文标记。