SVGs are human readable and human writable. I used SVG as a templating/markup language for years. We were writing software for a specialized, embedded, browser

SVGs are human readable and human writable. I used SVG as a templating/markup language for years. We were writing software for a specialized, embedded, browser that only understood JS and SVG. It only took a few days of acclimatization to move from writing HTML to writing SVG.