I think your premise of infinite zoom is wrong-hatted.
If you will be using a browser, you will get a five-fold zoom in and a 10-fold zoom out.
No everyone will have a Xara product that allow 256-fold zoom in or thereabouts.
Going to PDF and you get limited by its dpi setting. 1200dpi is a 4-fold increase over normal print.

Using the Xara Extrude generates bitmaps.

Your best best would be to generate SVGs. You may then be able to script a must larger zoom.
I doubt you have a suitable Xara product at present.

I've just tried 500-fold zoom on 99 objects in a browser.
Code:
.zoom {
  animation: scale 16s ease-in-out infinite;
}
@keyframes scale {
  50% {
    transform:scale(500);
  }
}
and the browser began to struggle.

Any scene would probably handle nested zooms to around 10,000-fold with careful planning.

Acorn