/usr/share/doc/libtyxml-ocaml-doc/api is in libtyxml-ocaml-doc 3.0.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libtyxml-ocaml-doc/../libtyxml-ocaml-dev/api
/usr/share/doc/libtyxml-ocaml-doc/../libtyxml-ocaml-dev/api