<link rel="import" href="../catalog-data/catalog-data.html"> <dom-module id="catalog-element"> <template> <catalog-data element-map="{{_elements}}"></catalog-data> </template> </dom-module> <script> Polymer({ is: 'catalog-element', properties: { name: {type: String, notify: true}, _elements: Object, data: {type: Object, notify: true, computed: 'getData(_elements,name)'} }, getData: function(_elements,name) { if (!_elements) return; return _elements[name]; } }); </script>