Constituents of Milk Chocolate

Hi,
Following! What would you be expecting to find in milk chocolate?
Casein, beta lactoglobulin, lactose or all three?
Any articles you can link to would be most appreciated :)

EUR-Lex - 32000L0036 - EN - EUR-Lex (europa.eu)

I'd say anything you'd expect to find in milk, you'd also expect to find in milk chocolate.