In the beginning of my career, about 15 years ago, I had a job working with a large auto parts retailer and they had all of their products in these massive XML files. We used XSLT to transform those into all kinds of things, including physical printed catalogues that would go in their stores. Obviously the XSLT didn't actually print catalogues, but we did turn them into some format that I forget now (maybe PDF!) that we could just send straight to the printers.

It was pain and suffering developing these style sheets, but once done it worked like a charm.