引用与可追溯Citations and Traceability

引用要看对应关系，不是看链接数量。ALCE 把带引用的生成拆成流畅度、正确性、引用质量三类自动指标，其中引用质量检查的是这句话能不能被它引的那份来源支持。

托管的接地会把结构直接给你。Google 搜索接地的官方文档描述：响应里带来源数组（含 uri 与 title），另有一个把回答文本片段对应到来源的结构，界面用它渲染内嵌的来源链接，并按规定展示提示。

媒体文件的出处走另一条路。C2PA 是一套开放标准，用凭证记录内容的来源与编辑过程，跟「回答引用网页」不是一回事：它管的是素材本身，不是文本里的引用。

版本与时间点也要留：模型版本、知识截止、检索到的文档版本、抓取日期。缺一样，倒查就只能停在「大概那个时候」。

Citations are about correspondence, not link count. ALCE defines automatic metrics across fluency, correctness and citation quality, where citation quality checks whether the statement holds up against the source it points to.

Hosted grounding hands you the structure directly. Google's documentation for search grounding describes a response containing source entries with a uri and a title, plus a mapping from spans of the answer text to those sources, which an interface uses to render inline citation links under the required display terms.

Media provenance runs on a different track. C2PA is an open standard for recording where a piece of content came from and how it was edited; that is about the asset itself, not about a text answer citing a page.

Keep versions and timestamps as well: model version, knowledge cutoff, the revision of the retrieved document, the date it was fetched. Miss one and the trail only goes back to sometime around then.