Is it possible to use Semantic forms to introduce multiple categories within one field in the form
So in effect: use categories as kind of tags?

Using within the form:
! Has category: | {{{field|Hascategory}}}
And within the template to be included in the page made with the form:
[[Category:[[ {{#arraymap:{{{Hascategory|}}}|,|x|[[Has category::x]]}}]]
does not work, which is not surprising I guess.

Any ideas on adding multiple categories through a form?