Wow, this is cool. It looks like an API capable of things that Vector Magic[1] can do, but FOSS. Vector Magic has been excellent for some occasions where you have a rasterized clipart, but need it as a vector.
I love and use Inkscape exclusively for any SVG editing, but this particular feature in Inkscape is woefully under anything I've seen vector magic provides.
[1]https://vectormagic.com/