BPEL specifications

Process

<process name="SampleProcess"

 targetNamespace="http://oasis-open.org/WSBPEL/Primer/"

 xmlns="http://docs.oasis-open.org/wsbpel/2.0/process/executable" />

Scope

<scope name="Scope" />

Relationship to Business Partners: Partner links

<partnerLinks>

 <partnerLink name="ClientStartUpLink"

 partnerLinkType="wsdl:ClientStartUpPLT" myRole="Client" />

</partnerLinks>

State of a BPEL Process: Variables

<variables>

 <variable name="myVar1" messageType="myNS:myWSDLMessageDataType" />

 <variable name="myVar1" element="myNS:myXMLElement" />

 <variable name="myVar2" type="xsd:string" />

 <variable name="myVar2" type="myNS:myComplexType" />

</variables>

Behavior of a BPEL Process

Providing and Consuming Web Services:

Receive

<receive name="ReceiveRequestFromPartner"

 createInstance="yes"

 partnerLink="ClientStartUpPLT"

 operation="StartProcess" ... />

Reply

<reply name="ReplyResponseToPartner"

 partnerLink="ClientStartUpPLT"

 operation="StartProcess" ... />

Invoke(one way)

<invoke name="OneWayInvoke" WS-BPEL 2.0 Primer 9 May 2007

Copyright © OASIS Open 2007. All Rights Reserved. Page 13 of 66

 partnerLink="BusinessPartnerServiceLink"

 operation="OneWayOperation"

 inputVariable="Input" />

Invoke(request-response)

<invoke name="RequestResponseInvoke"

 partnerLink="BusinessPartnerServiceLink"

 operation="RequestResponseOperation"

 inputVariable="Input"

 outputVariable="Output" />

Structuring the Process Logic

Sequence(sequential)

<sequence name="InvertMessageOrder">

 <receive name="receiveOrder" ... />

 <invoke name="checkPayment" ... />

 <invoke name="shippingService" ... />

 <reply name="sendConfirmation" ... />

</sequence>

Sequence(with if-else)

<if name="isOrderBiggerThan5000Dollars">

 <condition>

 $order &gt; 5000

 </condition>

 <invoke name="calculateTenPercentDiscount" ... />

 <elseif>

 <condition>

 $order &gt; 2500

 </condition>

 <invoke name="calculateFivePercentDiscount" ... />

 </elseif>WS-BPEL 2.0 Primer 9 May 2007

Copyright © OASIS Open 2007. All Rights Reserved. Page 14 of 66

 <else>

 <reply name="sendNoDiscountInformation" ... />

 </else>

</if>

Repetitive Activities

While

<while>

 <condition>

 $iterations &gt; 3

 </condition>

 <invoke name="increaseIterationCounter" ... />

</while>

Repeat until

<repeatUntil>

 <invoke name="increaseIterationCounter" ... />

 <condition>

 $iterations &gt; 3

 </condition>

</repeatUntil>

For-each

<forEach parallel="no" counterName="N" ...>

 <startCounterValue>1</startCounterValue>

 <finalCounterValue>5</finalCounterValue>

 <scope>

 <documentation>check availability of each item ordered</documentation>

 <invoke name="checkAvailability" ... />

 </scope>

</forEach>

Parallel Processing

Flow

<flow ...>

 <links> ... </links>

 <documentation>

 check availability of a flight, hotel and rental car concurrently

 </documentation>

 <invoke name="checkFlight" ... />

 <invoke name="checkHotel" ... />

 <invoke name="checkRentalCar" ... />

</flow>

Link in flow

<flow ...>

 <links>

 <link name="checkFlight-To-BookFlight" />

 </links>

 <documentation>

 check availability of a flight, hotel and rental car concurrently

 </documentation>

 <invoke name="checkFlight" ...>

 <sources>

 <source linkName="checkFlight-To-BookFlight" />

 </sources>

 </invoke>

Data Manipulation

Assign

<assign>

 <copy>

 <from variable="TimesheetSubmissionFailedMessage" />

 <to variable="EmployeeNotificationMessage" />

 </copy>

</assign>