what is the official language of tristan da cunha , which is the target area of asiatic: iium journal of english language and literature journal ?
SELECT DISTINCT var_uri where brack_open dbr_Tristan_da_Cunha dbo_officialLanguage var_uri sep_dot dbr_Asiatic:_IIUM_Journal_of_English_Language_and_Literature dbo_academicDiscipline var_uri brack_close