Hey so, genuine programming question.
I want a language made for GUI applications that is not HTML/XML-based. It can still be a markup language; my main hangup with the "XML style" is how often you have to repeat yourself, how obscured information becomes under the length of tags, and how annoying it is to change tags. I do appreciate descriptive elements, and I am willing to make my own API based on a different markup language if it comes to it.
Is there something like this?

/ ASD can make change difficult, give me time and I may adjust.