What is "primaballerina"

"Primaballerina" is a 1969 song performed by Swedish singer Siw Malmkvist and written by Hans Blum. It was the German entry in the Eurovision Song Contest 1969. Malmkvist was the second of three female Scandinavian schlager artists to represent Germany in the Contest in the late 1960s and early 1970s, the first being Norwegian Wenche Myhre in 1968 with " Ein Hoch der Liebe" and the third Danish Gitte Hænning with " Junger Tag in 1973. Malmkvist had previously also represented her native Sweden in the 1960 Contest with " Alla andra får varann".