Display data from multiple tables using wcf service

Question

This is my data model

Load
	Order Number
	Book Date
	Booked By
	Status
	Invoice Status
	PaperWork Status
	Bill To
	Start Date
	Completion Date
	Total Miles
	Trailer
	Priority
	Freight (0..n)
	Load Requirement (0..n)
	Stop (1..n)

Using this one create wcf service,
What is the meaning of the above? 

I want this type of output
<OrderNumber>1</OrderNumber> <BookDate>2014-07-21T00:00:00</BookDate> <BookedBy>Sampath</BookedBy> <CompletionDate>2014-04-23T00:00:00</CompletionDate> <Freight> <Commodity>...</Commodity> <Count>...</Count> <CountUnit>...</CountUnit> ... </Freight> <InvoiceStatus>p</InvoiceStatus> <LoadRequirement>sam</LoadRequirement> <Note>varify</Note> <PaperWorkStatus>Wait</PaperWorkStatus>

Once see my code