The file you posted is definitely a variant on html. Hopefully someone else will recognize it right off as whatever kit it is part of. Perhaps it is rich text, perhaps some other format--but replace qt
with html
and you'll see it marked up in a web browser.
QML is a language that uses JavaScript style syntax for building applications. In my opinion it is a lot of fun to work with. You can download an IDE at:
My guess is you have a Qt Quick application that you're looking at, I'd venture a guess at Qt4 but I'm new to the toolkit so my knowledge is rather contemporary.