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The more I read up on that warning, the more I think it is a bug in epubcheck. AFAICT, the xlink:title attribute only is needed for svg anchor "a" tags. Svg has its own "a" tag. So your image tags should not need it. Could it be your code is simply missing the svg close tag in places that results in anchor tags being subsumed into the svg namespace?
Does your code ever use an svg anchor "a" tag?
KevinH
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