Glossary
Content hash
A content hash is a SHA-256 digest of a document’s normalised parsed text; Arieta Data records a new version whenever the hash changes.
Hashing the parsed text, not the upstream HTML, means page-chrome changes (menus, banners) never create versions, while every real text change does.
A hash change can also come from a parser upgrade of the current version. The history SKU says so in diffSummary when that is the cause.
Sources
Related terms
Point-in-time data
Point-in-time data records what a source said at each moment, so a model or eval can be restricted to information that existed on a given date.
Tombstone
A tombstone is a record in a delta snapshot saying that a previously delivered record has been withdrawn and must be deleted by every licensee.
Snapshot
An Arieta Data snapshot is a complete, immutable monthly cut of every SKU, identified YYYY-MM and shipped with a manifest of counts and SHA-256 checksums per shard.
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