VAST-2.0-root-element Root element must be <VAST> VAST Spec VAST-2.0-root-version <VAST> must have a version attribute VAST Spec VAST-2.0-root-version-value VAST version attribute must be a recognised version string VAST XSD VAST-2.0-root-has-ad-or-error <VAST> must contain at least one <Ad> or <Error> VAST Spec VAST-4.0-wrapper-root-error <VAST> root contains both <Ad> and <Error> elements (invalid per VAST 4.0) VAST Spec VAST-2.0-ad-has-inline-or-wrapper Each <Ad> must contain exactly one <InLine> or <Wrapper> VAST Spec VAST-2.0-inline-adsystem <InLine> must contain <AdSystem> VAST Spec VAST-2.0-inline-adtitle <InLine> must contain <AdTitle> VAST Spec VAST-2.0-inline-impression <InLine> must contain at least one <Impression> VAST Spec VAST-2.0-inline-creatives <InLine> must contain <Creatives> with at least one <Creative> VAST Spec VAST-4.1-adservingid-present <InLine> must contain…