@ManyToOne
    @PrimaryKeyJoinColumns(value = {
        @PrimaryKeyJoinColumn(name = "country_code", referencedColumnName = "country_code"),
        @PrimaryKeyJoinColumn(name = "zip_code", referencedColumnName = "code")
    })
    private Zip zip;

    @ManyToOne
    @PrimaryKeyJoinColumns(value = {
        @PrimaryKeyJoinColumn(name = "country_code", referencedColumnName = "country_code"),
        @PrimaryKeyJoinColumn(name = "state_code", referencedColumnName = "state_code"),
        @PrimaryKeyJoinColumn(name = "city_name", referencedColumnName = "name")
    })
    private City city;