Showing URLs as plain text
Thank you for your reply!
I actually noticed the "link" option in the table format just a few minutes after writing my message. It worked well for interwiki links but not for outgoing links.
This is propably actually because of Mediawiki and not SMW. It changes all strings starting with "http" into a working link unless you use nowiki tags around the link.
However it is not possible to add those nowiki tags in this case.
What is needed is a plain format option for the url datatype which basically adds those nowiki tags around the links while printing the table.