By the way – XML is most definitely NOT “..more or less just a notepad file, dot separated..”
That sounds more like a variation on a CSV file. An XML file is :
a markup language that defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. It is defined in the XML 1.0 Specification produced by the W3C, and several other related specifications, all free open standards.
Just look at one of the XML files in a reports module in kiwitrees to see how complex they are. They are just like HTML, but with a need to learn yet another language on top of the html / js / php / css we already have to handle.