code: func (s *Session) AssignChildren(parent Identifiable, children []Identifiable, identity Identity) *Error {
  
  	url, berr := s.getURLForChildrenIdentity(parent, identity)
  	if berr != nil {
  		return berr
  	}
  
  	var ids []string
  	for _, c := range children {
  
  		if i := c.Identifier(); i != "" {
  			ids = append(ids, c.Identifier())
  		} else {
  			return NewBambouError("VSD Error", "One of the object to assign has no ID")
  		}
  	}
  
  	buffer := &bytes.Buffer{}
  	json.NewEncoder(buffer).Encode(ids)
  
  	request, err := http.NewRequest("PUT", url, buffer)
  	if err != nil {
  		return NewBambouError("HTTP transaction error", err.Error())
  	}
  
  	response, berr := s.send(request, nil)
  	if berr != nil {
  		return berr
  	}
  	defer response.Body.Close()
  
  	return nil
  }
docs: // AssignChildren assigns the list of given child Identifiables to the given Identifiable parent in the server.