VAST-2.0-ctv-mezzanine-values
Mezzanine dimensions must be non-negative integers and type must be a MIME type
Short answer
The addendum Mezzanine model requires a MIME type and non-negative integer width and height values. Delivery and the asset URI are checked by their existing rules. Native VAST 4.0 Mezzanine retains its simple URI model.
Why this matters in production
This rule is usually a delivery blocker. Many players, SDKs, and ad servers will discard the response or skip the affected creative once this condition is hit. These rules validate supplied standardized payloads carried in legacy VAST extensions. Correct version and location handling preserves compatibility while checking ID registries, mezzanine assets, SIMID payloads and creative bindings. Optional addendum features remain optional. Affected scope: VAST 2.0 and later (all versions).
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