initial upload of extension sample

node_modules/_base/db/capire_common.cds

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+using { sap } from '@sap/cds/common';
+
+
+extend sap.common.Currencies with {
+  // Currencies.code = ISO 4217 alphabetic three-letter code
+  // with the first two letters being equal to ISO 3166 alphabetic country codes
+  // See also:
+  // [1] https://www.iso.org/iso-4217-currency-codes.html
+  // [2] https://www.currency-iso.org/en/home/tables/table-a1.html
+  // [3] https://www.ibm.com/support/knowledgecenter/en/SSZLC2_7.0.0/com.ibm.commerce.payments.developer.doc/refs/rpylerl2mst97.htm
+  numcode  : Integer;
+  exponent : Integer; //> e.g. 2 --> 1 Dollar = 10^2 Cent
+  minor    : String; //> e.g. 'Cent'
+}
+
+
+/**
+ * The Code Lists below are designed as optional extensions to
+ * the base schema. Switch them on by adding an Association to
+ * one of the code list entities in your models or by:
+ * annotate sap.common.Countries with @cds.persistence.skip:false;
+ */
+
+context sap.common_countries {
+
+  extend sap.common.Countries {
+    regions   : Composition of many Regions on regions._parent = $self.code;
+  }
+
+  entity Regions : sap.common.CodeList {
+    key code : String(5); // ISO 3166-2 alpha5 codes, e.g. DE-BW
+    children  : Composition of many Regions on children._parent = $self.code;
+    cities    : Composition of many Cities on cities.region = $self;
+    _parent   : String(11);
+  }
+  entity Cities : sap.common.CodeList {
+    key code  : String(11);
+    region    : Association to Regions;
+    districts : Composition of many Districts on districts.city = $self;
+  }
+  entity Districts : sap.common.CodeList {
+    key code  : String(11);
+    city      : Association to Cities;
+  }
+
+}

node_modules/_base/db/schema.cds

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+using   from './schema_bookshop';
+using   from './schema_orders';
+
+annotate cds.UUID with @(Core.Computed : true);

node_modules/_base/db/schema_bookshop.cds

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+using { Currency, managed, sap } from '@sap/cds/common';
+namespace sap.capire.bookshop;
+
+entity Books : managed {
+  key ID : Integer;
+  title  : localized String(111);
+  descr  : localized String(1111);
+  author : Association to Authors;
+  genre  : Association to Genres;
+  stock  : Integer;
+  price  : Decimal;
+  currency : Currency;
+  image : LargeBinary @Core.MediaType : 'image/png';
+}
+
+entity Authors : managed {
+  key ID : Integer;
+  name   : String(111);
+  dateOfBirth  : Date;
+  dateOfDeath  : Date;
+  placeOfBirth : String;
+  placeOfDeath : String;
+  books  : Association to many Books on books.author = $self;
+}
+
+/** Hierarchically organized Code List for Genres */
+entity Genres : sap.common.CodeList {
+  key ID   : Integer;
+  parent   : Association to Genres;
+  children : Composition of many Genres on children.parent = $self;
+}

node_modules/_base/db/schema_orders.cds

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+using { Currency, User, managed, cuid } from '@sap/cds/common';
+namespace sap.capire.orders;
+
+entity Orders : cuid, managed {
+  OrderNo  : String @title:'Order Number'; //> readable key
+  Items    : Composition of many Orders_Items on Items.up_ = $self;
+  buyer    : User;
+  currency : Currency;
+}
+
+entity Orders_Items {
+  key ID    : UUID;
+  up_       : Association to Orders;
+  product   : Association to Products @assert.integrity:false; // REVISIT: this is a temporary workaround for a glitch in cds-runtime
+  amount    : Integer;
+  title     : String; //> intentionally replicated as snapshot from product.title
+  price     : Double;
+}
+
+/** This is a stand-in for arbitrary ordered Products */
+entity Products @(cds.persistence.skip:'always') {
+  key ID : String;
+}