Assertion: inner substitution | /r/CapableOf | give the prefix of namespace
Facets:
Source sentences:
text: This evaluates to the empty string if the template is being substituted (since the inner substitution takes effect, giving the prefix of namespace 0, which is empty), but to "{{subst:ns:0}}" if the template is being transcluded (since substitution cannot take place after transclusion).