[Orgmode] (org-entry-properties nil 'all) does not return inherited properties

[Holger Macht]

Hi,

(org-entry-properties nil 'all) does not return inherited properties
added with a file directive like that:

#+PROPERTY: propkey propval

Is this by intention? If so, is there a method to get all the properties
of an item, also inherited ones?

Currently I was just able to find (org-entry-get), but this only returns
one specific property of which I need to know the name.

Thanks,
 Holger