The IAB's own VAST sample tags pass XSD validation, and two of them still break the spec

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If you build a video player, an ad server, or anything that touches VAST, the IAB Tech Lab VAST_Samples repo is probably where you got your test fixtures. I ran every file in it through two checks: xmllint against the official IAB XSD for each file's declared version. vastlint, an open-source linter with 235 rules taken from the XSDs and from the normative text of the spec (the RFC 2119 "must" and "required" sentences). The short version: 75 files, 4 with spec errors, 72 with at least one warning, and 2 files that pass the XSD while breaking the VAST 4.1 spec text. The full write-up, including

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