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SVG warning: Attribute space of element style: already defined

JoeBush
Hi all, I'm processing an RPG book with SVG graphics in it produced in Affinity. When I run it through prince, I get numerous warnings (one per SVG, I think) reading:

prince: http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd:2278: warning: Attribute space of element style: already defined


How do I fix the SVG files or hide the warning? I want my console output to be clean so I can see the output of previous steps prior to running prince without having to scroll up every time. I'm not familiar with hand-coding SVGs, but there may be a setting in affinity I can change if there's something wrong with the SVG, I just don't understand what the problem is. Also, the prince error doesn't really indicate which SVG is the problem, so that makes it harder to track down.