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1. build -> this directory will contain everything needed to generate the jar containing the Shopping Store app.
   1. wsdl
      1. shoppingstore.wsdl -> the reduced Amazon WSDL
   2. shoppingstore.composite -> the content of this file will be explained later
2. dist -> this directory will contain everything needed to run the Shopping Store application
3. lib -> lib required to compile and run the Shopping Store application
   1. AWS2007_05_14.jar -> the jar file we have just created
4. src -> directory containing the source code of the Shopping Store application (we will be explain it later)
   1. shoppingstore
      1. server
         1. ShoppingStoreServer.java
      2. services
         1. cart
            1. CartService.java
            2. CartServiceImpl.java

Now, let us specify its interface (which, in this case, will be identical to the skeleton shown before) in a java file named CartService.java:

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