Chapter 4 XML Processing
149
 Account Processing
 XML
 Workflow 
Document 
Credit Card 
Dispatching 
Processing
Logic
 Airline Reservation 
Processing
Figure 4.7
Flexible Mapping Applied to a Travel Service Scenario
This technique is particularly useful for implementing a document oriented
workflow where components exchange or have access to entire documents but
only manipulate portions of the documents. For example, Figure 4.7 shows how a
PurchaseOrder
 document may sequentially go through all the stages of a work 
flow. Each stage may process specific information within the document. A credit
card processing stage may only retrieve the 
CreditCard
 element from the
PurchaseOrder
 document. Upon completion, a stage may  stamp  the document
by inserting information back into the document. In the case of a credit card pro 
cessing stage, the credit card authorization date and status may be inserted back
into the 
PurchaseOrder
 document.
4.3.4.3
XML Componentization
For a document centric processing model, especially when processing documents in
the EJB tier, you may want to create generic, reusable components whose state is
serializable to and from XML. (See  Designing Domain Specific XML Schemas 






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