Google contributed to the help documentation for the logo schema/structured information that you can now use ImageObject type to define an organization logo. This remains in addition to just the URL type.Google said this provides more versatility for this schema.Previously, the assistance documents only specified the URL type for logo schema.Why should an ImageObject type be utilized rather of URL type? If you want to provide data about the image, you need to use ImageObject since you cant add properties to an URL value. Such information could be the height and width of the image, or its author, or its caption and so on.More on this ImageObject can be found on discussion at Twitter.