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+;  Licensed to the Apache Software Foundation (ASF) under one
+;  or more contributor license agreements.  See the NOTICE file
+;  distributed with this work for additional information
+;  regarding copyright ownership.  The ASF licenses this file
+;  to you under the Apache License, Version 2.0 (the
+;  "License"); you may not use this file except in compliance
+;  with the License.  You may obtain a copy of the License at
+;  
+;    http://www.apache.org/licenses/LICENSE-2.0
+;    
+;  Unless required by applicable law or agreed to in writing,
+;  software distributed under the License is distributed on an
+;  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+;  KIND, either express or implied.  See the License for the
+;  specific language governing permissions and limitations
+;  under the License.
+
+; Currency implementation
+
+(define (currency_convert from to amount) 
+  (if (equal? to "EUR") (* amount 0.70) amount)
+)
+
+(define (currency_symbol currency) 
+  (if (equal? currency "EUR") "E" "$")
+)
+
+(define (currency_impl op args)
+  (cond
+    ((equal? op "convert") (apply currency_convert args))
+    ((equal? op "symbol") (apply currency_symbol args))
+  )
+)
+
+; Currency composite
+
+(define (currency_service op . args) (currency_impl op args))
+
+; Catalog implementation
+
+(define (catalog_get converter)
+  (define (convert price) (converter "convert" "USD" "USD" price))
+
+  (define code "USD")
+  (define symbol (converter "symbol" code))
+
+  (list
+    (list (list 'name "Apple") (list 'currencyCode code) (list 'currencySymbol symbol) (list 'price 2.99))
+    (list (list 'name "Orange") (list 'currencyCode code) (list 'currencySymbol symbol) (list 'price 3.55))
+    (list (list 'name "Pear") (list 'currencyCode code) (list 'currencySymbol symbol) (list 'price 1.55))
+  )
+)
+
+(define (catalog_impl converter op args)
+  (cond
+    ((equal? op "items") (apply catalog_get (cons converter args)))
+  )
+)
+
+; Catalog composite
+
+(define (catalog_service op . args) (catalog_impl currency_service op args))
+
+; Cart implementation
+
+(define (cart_post content item)
+  (cons (cons "Item" (list (uuid) item)) content)
+)
+
+(define (cart_getall content)
+  (cons "Sample Feed" (cons (uuid) content))
+)
+
+(define (cart_getentry id)
+  (define entry (list (list 'name "Apple") (list 'currencyCode "USD") (list 'currencySymbol "$") (list 'price 2.99)))
+  (cons "Item" (list id entry))
+)
+
+(define (cart_total)
+  10.0
+)
+
+(define (cart_impl op args)
+  (cond
+    ((equal? op "post") (apply cart_post args))
+    ((equal? op "getall") (apply cart_getall args))
+    ((equal? op "getentry") (apply cart_getentry args))
+    ((equal? op "total") (apply cart_total args))
+  )
+)
+
+; Store UI implementation
+
+(define (storeui_post cart content item)
+  (cart "post" content item)
+)
+
+(define (storeui_getcart cart content)
+  (cart "getall" content)
+)
+
+(define (storeui_getentry cart id)
+  (cart "getentry" id)
+)
+
+(define (storeui_items catalog)
+  (catalog "items")
+)
+
+(define (storeui_total cart)
+  (cart "total")
+)
+
+(define (storeui_impl cart catalog op args)
+  (cond
+    ((equal? op "post") (apply storeui_post (cons cart args)))
+    ((equal? op "getall") (apply storeui_getcart (cons cart args)))
+    ((equal? op "getentry") (apply storeui_getentry (cons cart args)))
+    ((equal? op "items") (apply storeui_items (cons catalog args)))
+    ((equal? op "total") (apply storeui_total (cons cart args)))
+  )
+)
+
+; Store UI composite
+
+(define (cart_service op . args) (cart_impl op args))
+
+(define (storeui_service op . args) (storeui_impl cart_service catalog_service op args))
+
+; Store UI test case
+
+(define catalog (storeui_service "items"))
+(define empty (list))
+(define apple (car catalog))
+(define orange (car (cdr catalog)))
+(define added1 (storeui_service "post" empty apple))
+(define added2 (storeui_service "post" added1 orange))
+(display (storeui_service "getall" added2))
+(display (storeui_service "total"))
+