Currently there are lots of pages in the main namespaces that are basically subpages [0].
I've addressed the issue on IRC #wikimedia-nl and in the local village pump [1].
There were a few cases on which a slash did not illustrate a subpage but those have been taken care of in the mean time.

[0] http://meta.wikimedia.org/wiki/User:Krinkle/Queries/nlwikimedia_slasharticles
[1] http://nl.wikimedia.org/wiki/Wikimedia:De_kroeg#Subpagina.27s_aanzetten_in_de_hoofdnaamruimte

Version: unspecified
Severity: normal
URL: http://nl.wikimedia.org/wiki/Wikimedia:De_kroeg#Subpagina.27s_aanzetten_in_de_hoofdnaamruimte