Both the Typescript and Babel compilers have excellent support for embedding XML in Javascript. This is called JSX and was motivated by the popularity of the React UI library for rendering HTML.

The key, said Antony Campitelli, formerly of Macromedia and now Laszlo's vice president of marketing, is finding a way to get around the twin problems of slow connections and often-overloaded servers.

He specifically compares how easy it is to use JSON in JavaScript as compared to using XML in JavaScript. For Groovy, both are easy to handle thanks to Groovy’s excellent XML and JSON support.