Well, the library structure is Poser's (and if you weren't using Poser youu could move all hair related files into the hair library, put the mat files in with their clothes and so on). Native files (.daz scene files and .ds/.dsb preset and script files) can be arranged how you want - you don't even have to keep them in a D|S content folder, if you don't mind using File>Merge to add them to your scene.