I am trying to analyse the sentence:
Building land is a plot of land in relation to which a construction permit has been issued.
and my question is - what type of subordinated clause is introduced by the phrase/conjunction
in relation to which? And is this conjunction somehow different from other subordinating conjunctions?
I would like to read more about this specific phrase/conjunction, but I can not found any book or article about it, of course, there are a lot of articles and books about traditional subordinating conjunctions. I am interested both in semantics (better yet - categorial grammar, type logical, abstract categorial grammar) and syntax of this phrase.