the infanta is a baby...she's not getting married or even betrothed, it's her coronation, a celebration of her birth (or discovery, as the end of the song seems to imply). the "veiled young virgin" is betrothed to the prince, presumably the infanta's brother, and due to her place in this parade we can assume she's the daughter of the king of moors (marrying her to a spanish prince would be a rather strategic political alliance). the baroness is seething because she's childless and everybody's celebrating this lovely little baby.
the infanta is a baby...she's not getting married or even betrothed, it's her coronation, a celebration of her birth (or discovery, as the end of the song seems to imply). the "veiled young virgin" is betrothed to the prince, presumably the infanta's brother, and due to her place in this parade we can assume she's the daughter of the king of moors (marrying her to a spanish prince would be a rather strategic political alliance). the baroness is seething because she's childless and everybody's celebrating this lovely little baby.