Cleft constructions
As shown in the page about the comp:cleft relation, the cleft constructions are analysed with a comp:cleft relation going from the head of the main sentence to the head of the complement.
With qui and que direct object, the cleft clause is analysed as a relative clause.
In particular, qui and que are analysed as relative pronouns (PRON).
In the other cases, the cleft clause is analysed as a complement clause, with que as a SCONJ.