When PD4ML encounters <svg> tag it tries to instantiate BatikSvgCustomTag class. If Batik library is missing it fails and fallbacks to our built-in proprietary SVG renderer.
No explicit API calls needed to activate it.
Batik is more strict regarding SVG syntax, so if it starts to panic e.g. because of missing namespace xmlns="http://www.w3.org/2000/svg"
in <svg> tag - that means Batik is definitely in action.
You may explicitly disable Batik by
com.pd4ml.plugins.BatikSvgCustomTag.disable = true;