In a large saucepan, combine the water, sugar, sherry, clove and cinnamon stick. Bring to a boil over moderately high heat, stirring occasionally, until the sugar dissolves completely. Remove the clove and cinnamon stick and add the plums and mango. Simmer over moderate heat until the fruit is barely tender, about 5 minutes. Add the berries and simmer for 3 minutes longer. Transfer the compote to a bowl to cool slightly.