Angular2: replace host element with component’s template

This you should get what you want:

@Component({
  selector: 'ul[my-list]',
  template: `
    <ng-content></ng-content>
  `
})
export class MyList {
}

@Component({
  selector: 'li[my-item]',
  template: `
    <ng-content></ng-content>
  `
})
export class MyItem {
...
}

<ul my-list>
    <li my-item>One</li my-item>
    <li my-item>Two</li my-item>
</ul my-list>