This! And the referent for both is the SAME PERSON THEY DENOTE! So "poet Burns" identifies the person by his name and his occupation. In "Chancellor Merkel" - by position and name. In "Ms Merkel" - by (wrong) marital status and name.
And you never ascribed a syntactic function to what you deny in being an apposition.
Did they treat all people the same irrespectively of their skin color and nationality?
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