<div class="header">
   
   <img class="logo">
   
 <ul class="menu"> <li class="menu__item">  <a class="menu__link" href="#"></a>  </li>  <li class="menu__item">  <a class="menu__link" href="#"></a>  </li>  </ul>

</div>
 

{
    block: 'header',
    content : [
   { block : 'logo' }, 
   { block : 'menu',
      content: [
         {
         elem: 'item' ,
         content : [
                        { elem : 'link' }
                    ]
         },
         {
         elem: 'item' ,
         content : [
                        { elem : 'link' }
                    ]
         }
          ]      
       }     
   ] 
}