IAB VAST (Video Ad Serving Template), Version 4.4 - DRAFT for working group discussion. This draft is based on the published VAST 4.2 XSD structure and incorporates proposed VAST 4.4 CTV Ad Portfolio changes: - NonLinearAds support for CTV Pause, Screensaver, Overlay, Squeezeback, and In-Scene ads. - MediaFiles and Duration under NonLinear. - InteractiveCreativeFile under NonLinear MediaFiles for SIMID/nonlinear interactivity. - Icons under NonLinearAds. - Standard QR code CreativeExtension elements. - Standardized VAST Extensions payloads may carry plcmt, pos, playbackmethod, and attr. NOTE: This draft intentionally uses xs:string for URI-like elements to avoid rejecting valid VAST macro syntax or placeholder values during working-group discussion. The final publication may tighten these types if desired. VAST 4.4: MediaFiles may be used under Linear or under NonLinear. Under NonLinear, MediaFiles enables CTV Ad Portfolio image, video, and interactive creative file delivery. VAST 4.4: NonLinearAds can represent CTV Ad Portfolio formats that appear alongside, over, or within content without mandating a dedicated content interruption, including Pause, Screensaver, Overlay, Squeezeback, and In-Scene ads. Menu Ads are outside this VAST NonLinearAds model and are signaled through Native API.