Creating new content (tables) through other tables
From semantic-mediawiki.org
Fragment of a discussion from Semantic MediaWiki Community Portal
> What exactly does [[Actor::{{{Actor|+}}}]]</code> do?
This is the WHERE clause of the query.
My example assumes that the {{{#ask:…}} statement is used on the template called, say Template:Actor's roles, which receives Actor as an argument: {{Actor's roles|Actor=John Smith}}.
If Actor is not given ({{Actor's roles}}), + will be used to choose all role subobjects where Actor property is set.
Another possible solution is to use the page title as the default value for Actor argument: [[Actor::{{{Actor|{{FULLPAGENAME}}}}}]]. In this case the template call on a page about an actor will look simply like this: {{Actor's roles}}.
