Should I put <ion-side-menus> inside <ion-view> and <ion-content>?

From my understanding, all content in <ion-nav-view> should be placed in <ion-view> and <ion-content>.
However, I found that the stater template of Ionic Framework is putting <ion-side-menus> right inside <ion-nav-view>.
Can anyone explain how it works? Thanks in advance.

Anyone can help me? Thanks!