[fao_]

It's an extremely large language, with most of the things that are normally availible as libraries, defined as part of the language itself. So of course the conversion is going to take a while, especially if the input data isn't very well formatted.

I don't really see how difficulty porting document sets to a nicer format translates into "This language isn't/doesn't foo", since that's more human error than the fault of the language itself.