(By Martin Haspelmath and Susanne Maria Michaelis): "As in WALS feature 90 (by Matthew S. Dryer), we define a relative clause as a clause that helps narrow the reference of a noun (the head) and in which the referent of the noun head has a semantic role. This feature is concerned with the order of ordinary attributive relative clauses, and with some special subtypes of relative clauses: ❡
Internally headed relative clauses are not adjacent to the notional head, but contain it inside them. ❡
The head of a correlative relative clause occurs inside the relative clause together with a relative marker and is taken up by a resumptive demonstrative-like element in the main clause. ❡
An adjoined relative clause is one which does not occur adjacent to the head noun and is not specially marked as relative clause."