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