I found the answer, embedded in the maillist thread posted in @Ajay's answer.
It seems that in order to solve this bug, they have moved SVGDOMImplementation
into package org.apache.batik.anim.dom
, which lives in the jar file batik-anim-1.8.jar.
As at the time of writing, the batik web site had not yet been updated, and for some reason this change was also not highlighted in the release notes.
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