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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.
wangp
Which operating system and Prince version are you using?