Extracting members from xml file doesn't work

Hello !
I am trying to make a docs generator for Zeal/Dash for SFML library.
I managed to generate the docs, the xml files and all the necessary files. Doxygen did a pretty good job.
I managed only to extract classes, structs and files.
But I cannot extract functions, enum, enumvalues. How can I do it ?
Link to my repository:

Also, you’ll need GNU/Linux to test it because it uses bash