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_packages/bookstore/db/schema.cds

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+namespace sap.capire.bookstore;
+
+// We reuse Products, which are Books in our domain
+using { sap.capire.products.Products as Books } from '@sap/capire-products';
+extend Books with {
+  author : Association to Authors;
+  rating : Decimal(2,1);
+}
+
+// We reuse aspect Person to define Authors
+using { sap.capire.contacts.Person } from '@sap/capire-contacts';
+entity Authors : Person {
+  key ID : UUID;
+  books  : Association to many Books on books.author = $self;
+}
+
+// we use enhanced currencies code lists
+using from '@sap/capire-currencies';