Semantic version: major (required), minor (required), patch (optional, default=0). Common HTTP image MIME types for banners, logos, etc. Predefined roles for branding images. Versioned branding descriptor. Contains a URI for the color palette and zero-or-more image references (logos, banners, etc.) with metadata. Reference to a previously-published image asset via URI, with required ID (xs:ID), optional role, dimensions, and MIME type.