(12)In the case of mixed contracts which can be separated, contracting authorities are always free to award separate contracts for the separate parts of the mixed contract, in which case the provisions applicable to each separate part should be determined exclusively with respect to the characteristics of that specific contract. On the other hand, where contracting authorities choose to include other elements in the procurement, whatever their value and whatever the legal regime the added elements would otherwise have been subject to, the main principle should be that, where a contract should be awarded pursuant to the provisions of this Directive, if awarded on its own, then this Directive should continue to apply to the entire mixed contract.