This example demonstrates the following aspects of the Extensible Markup Language (XML) support available with Spring Integration:

1. XPath Splitter - to split an order with multiple items into several order messages for separate processing.
2. XPath Router - to route messages according to the evaluation of an XPath expression which tests to see if the order item is in stock.
3. XPath Expression - which tests to see if the order item is in stock
4. XSLT Transformer - to transform the payload of the order message into a resupply message where the order item is found to be out of stock.

To run the sample, execute the class org.springframework.integration.samples.xml.BookOrderProcessingTestApp. Alternatively, you can run the sample using Maven by executing:

$ mvn clean package exec:java

You should see the following output:

INFO : org.springframework.integration.samples.xml.WarehouseDispatch - Warehouse dispatching orderItem: 
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<orderItem in-stock="true" xmlns="http://www.example.org/orders">
	<isbn>0321200683</isbn>
	<quantity>2</quantity>
</orderItem>

INFO : org.springframework.integration.samples.xml.ExternalResupply - Placing resupply order: 
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<bb:bigBooksOrder xmlns:bb="http://www.example.org/orders-bigbooks"
	xmlns:sb="http://www.example.org/orders">
	<bb:order>
		<bb:purchaser>smallbooks</bb:purchaser>
		<bb:quantity>5</bb:quantity>
		<bb:isbn>1590596439</bb:isbn>
	</bb:order>
</bb:bigBooksOrder>