An invisible correction
Fictional case: the reader deduplicates by identifier and misses a modification. Compare content and update time before saying nothing changed.
In-depth practical guides
Test reader delivery, preserve identifiers and detect silent collection gaps.
Updated :

AI-generated illustration · Reading room and research library. Illustrative scene.
A feed is a discovery channel, not necessarily a complete archive. Publishers can correct items, limit retention or change feeds. Compare received documents, reader behaviour and original pages.
Record URL, operator, format and topic scope. Inspect the response: success may return HTML instead of expected XML. Keep access date and state.
Store item identifier and public link separately. In Atom distinguish publication and update; do not assume every RSS guid is a URL. Changed titles need not mean new items.
Compare a known publication with the reader. Check polling, parsing failures and recovery after interruption. Include an update to an existing item.
Record oldest and newest entries, count and observed gaps. Compare a limited period with the publisher’s site. State what the feed cannot reconstruct.
Typical situations for preparing a check. They do not describe completed assignments or actual observations.
Fictional case: the reader deduplicates by identifier and misses a modification. Compare content and update time before saying nothing changed.
An illustrative feed keeps 20 items. A gap can lose publications if more than 20 arrive. Test a recovery source instead of claiming full coverage.
A tested monitoring channel with documented coverage and recovery.
No. Read the link element and guid attributes. Keep identifier and URL separate instead of making addresses from opaque identifiers.
Not for claimed historical coverage. Check retention and recovery; preserve relevant responses and compare primary documents.
TOOLS / REGISTERS
Accessibility does not guarantee freshness or completeness. Cache and timestamp differences can delay arrival. Missing feed items do not prove non-publication.