service_calls.xml - Example 1 using path for both data and request

service_calls.xml

<service_calls>
    <service_call name="selectedProduct" class="Mage_Catalog_Model_Product" method="load">
       <arg name="id">{{request.params.id}}</arg><!-- ID element from HTTP paraeters  substituted during evaluation of the path -->
    </service_call>
    <service_call name="locateProduct" class="Mage_Warehouse_Model_Locator" method="find">
       <arg name="productSku">{{data.selectedProduct.sku}}</arg><!-- substitutes the SKU of the selected product -->
       <arg name="zipCode">{{request.params.zip}}</arg><!-- substitutes the zip code from HTTP parameters -->
    </service_call>
<service_calls>