5 { id: '0', name:'Foods', numberOfItems:1, children:[ {_reference: '1'}, {_reference: '2'}, {_reference: '3'} ] },
6 { id: '1', name:'Fruits', numberOfItems:1, children:[ {_reference: '4'} ] },
7 { id: '4',name:'Citrus', numberOfItems:1, items:[ {_reference: '5'} ] },
8 { id: '5', name:'Orange'},
9 { id: '2', name:'Vegetables', numberOfItems:0},
10 { id: '3', name:'Cereals', numberOfItems:0}