No hyperlink to their api documentation on the homepage of libxfce4ui and libxfce4util .
gitlab links of both -https://gitlab.xfce.org/xfce/libxfce4ui -https://gitlab.xfce.org/xfce/libxfce4util
gitlab readme contains hyperlink to homepage of both of these libraries , but homepage or gitlab readme neither of them contains link to api documentation of these .
links of api documentation- https://developer.xfce.org/libxfce4util/ https://developer.xfce.org/libxfce4ui/