code: func workItemIncludeChildren(request *http.Request, wi *workitem.WorkItem, wi2 *app.WorkItem) {
  	childrenRelated := rest.AbsoluteURL(request, app.WorkitemHref(wi.ID.String())) + "/children"
  	if wi2.Relationships.Children == nil {
  		wi2.Relationships.Children = &app.RelationGeneric{}
  	}
  	wi2.Relationships.Children.Links = &app.GenericLinks{
  		Related: &childrenRelated,
  	}
  }
docs: // workItemIncludeChildren adds relationship about children to workitem (include totalCount)