How to get thumbnails into result datatable?

I am runing a german Wiki and so far I wasn't able to get thumbnails into the result datatable.

My query looks like this:

{{#ask: [[Kategorie:Archivalien]] | mainlabel=Titel | ?Bild | ?Signatur | ?Archivierungsart | ?Laufzeit | ?Quelle | ?Aufbewahrung der Originale | format=datatables | link=all | headers=show }}

All result data from the semantic attributes "Signatur", "Archivierungsart", "Laufzeit", "Quelle" and "Aufbewahrung der Originale" are listed correctly in the datatable. However, the attribute "Bild" contains the file name of a related picture (e.g. "hvg28.jpg") and I would like to have a thumbnail of that picture in the corresponding column of the result datatable. This is what does not work. What am I doing wrong? What are the requirements to get thumbnails into the result datatable?

Many thanks for any help!

Sochin67 (talk)

I am not sure it help after 6 months, but I may have a solution. In my wiki every page which has image has the property [[Has image::Image.jpg]] and when I just asked in the query ?Has image=Bild it shows the picture without any other hacking.

Grerika (talk)