This semantic template creates a section heading plus a list of subpages and their descriptions. it is probably best used immediately after a page's object template. Since September 2014, all pages with an infobox automatically include a list of subpages in that, so use of this template is optional (but recommended).
It works by checking Property:Has parentFullPageName and Property:Has fullPageName.
It only includes sub-pages which have these properties set - so in order to show up, subpages have to include Template:SMWDocs.