[TowerTall]

Use an XML editor like xmlspy or write a console app in your preferred programming language.

[nivertech]

Is there XMLSpy or something similar for Linux/Ubuntu?

Back in the day I used XMLSpy on Windows for XSD schema design, and liked it a lot.

I tried to look for a Linux version several years ago, but their website was a mess;(

Maybe it can work under Wine, or there is a browser-based version?