Fields media type "bottle" specified how primitive types

[njspok]

I run goagen bootstrap and get struct all fields specify how pointer (int, string e.t.c). But this example struct Bottle

type Bottle struct {
    // Account that owns bottle
    Account *AccountTiny `form:"account,omitempty" json:"account,omitempty" xml:"account,omitempty"`
    // API href of bottle
    Href string `form:"href" json:"href" xml:"href"`
    // ID of bottle
    ID int `form:"id" json:"id" xml:"id"`
    // Links to related resources
    Links *BottleLinks `form:"links,omitempty" json:"links,omitempty" xml:"links,omitempty"`

    // todo maybe Name *string ???
    Name  string       `form:"name" json:"name" xml:"name"`

    // Rating of bottle between 1 and 5
    Rating   *int   `form:"rating,omitempty" json:"rating,omitempty" xml:"rating,omitempty"`
    Varietal string `form:"varietal" json:"varietal" xml:"varietal"`
    Vineyard string `form:"vineyard" json:"vineyard" xml:"vineyard"`
    Vintage  int    `form:"vintage" json:"vintage" xml:"vintage"`
}