Webdav : cannot get 'tags' or 'display-name'

Hello everyone ,
I am new for NextCloud , and don’t know if that the right place for such a post .
Anyway , I am trying to read files properties via WebDav protocol using curl.
The problem , I don’t get the tags or the dispaly-name of files although I got all other properties like fileid, lastchange … etc…

I tries like this :