Could we briefly explain the semantic of "scale" here, even if it's obvious? So something like `If targeting a hi-DPI screen, this icon type may have a <literal>scale</literal> property with an integer value > 1 to denote the icon's scale factor, e.g. <code>scale="2"</code> for 2x scaling.` We could also refer to the Freedesktop Icon Theme Specification here, but that would likely be a bit too verbose.