[bpel] XPATH in <assign> element

[rainstar79]

Hi BPEL folks,
I have a question regarding the assign-element.
I modeled a simple BPEL process, where the input is an array of xsd:anyURI and the output should be a string of the e.g. the third element of this anyURI array. I assume, I have some problems withe the XPATH expression in the assign element.

This is the bpel file:

<?xml version="1.0" encoding="UTF-8"?>
<process name="HelloWorld" targetNamespace="urn:samples:review"
 xmlns="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
 xmlns:tns="urn:samples:review"
 xmlns:char="http://services.planets-project.eu/ifr/characterisation"
 xmlns:rep="http://services.planets-project.eu/ifr/reporting"
 xmlns:bpel="http://schemas.xmlsoap.org/ws/2003/03/business-process/"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xmlns:xsd="http://www.w3.org/2001/XMLSchema"
 xmlns:array="http://jaxb.dev.java.net/array"
 xsi:schemaLocation="http://schemas.xmlsoap.org/ws/2003/03/business-process/
 http://schemas.xmlsoap.org/ws/2003/03/business-process/">

 <partnerLinks>
 <!-- establishes the relationship with the caller agent -->
 <partnerLink name="caller" partnerLinkType="tns:Greeter-Caller"
 myRole="Greeter" />

 </partnerLinks>

 <variables>
 <!-- holds the incoming message -->
 <variable name="request" messageType="tns:nameMessage" />
 <!-- holds the outgoing message -->
 <variable name="response" messageType="tns:greetingMessage" />
 <variable name="dummy" type="xsd:anyURI" />

 </variables>

 <sequence>

 <!-- receive the name of a person -->
 <receive operation="sayHello" partnerLink="caller"
 portType="tns:Greeter" variable="request" createInstance="yes" />

 <!-- Assign the final Report to the output variable -->
 <assign>
 <copy>
 <from variable="request" expression="name/array:item[3]" />
 <to variable="response" part="greeting" />
 </copy>
 </assign>

 <!-- reply with the greeting -->
 <reply operation="sayHello" partnerLink="caller"
 portType="tns:Greeter" variable="response" />
 </sequence>

</process>

and this is the wsdl File:

<?xml version="1.0" encoding="UTF-8"?>
<definitions targetNamespace="urn:samples:review"
 xmlns="http://schemas.xmlsoap.org/wsdl/"
 xmlns:tns="urn:samples:review"
 xmlns:xsd="http://www.w3.org/2001/XMLSchema"
 xmlns:plt="http://schemas.xmlsoap.org/ws/2004/03/partner-link/"
 xmlns:char="http://services.planets-project.eu/ifr/characterisation"
 xmlns:rep="http://services.planets-project.eu/ifr/reporting"
 xmlns:array="http://jaxb.dev.java.net/array"
>


<types>
 <xs:schema targetNamespace='http://jaxb.dev.java.net/array' version='1.0' xmlns:xs='http://www.w3.org/2001/XMLSchema'>

 <xs:complexType final='#all' name='anyFileURIArray'>
 <xs:sequence>
 <xs:element maxOccurs='unbounded' minOccurs='0' name='item' nillable='true' type='xs:anyURI'/>
 </xs:sequence>
 </xs:complexType>

 </xs:schema>
 </types>

 <!-- characterizes the relationship between the greeter and its caller -->
 <plt:partnerLinkType name="Greeter-Caller">
 <plt:role name="Greeter" portType="tns:Greeter"/>
 </plt:partnerLinkType>


 <!-- carries the name of a person -->
 <message name="nameMessage">
 <part name="name" type="array:anyFileURIArray" />
 </message>

 <!-- carries the greeting -->
 <message name="greetingMessage">
 <part name="greeting" type="xsd:string" />
 </message>

 <!-- describes the interface presented to callers -->
 <portType name="Greeter">
 <operation name="sayHello">
 <input message="tns:nameMessage" />
 <output message="tns:greetingMessage" />
 </operation>
 </portType>

</definitions>

The SOAP request of the deployed workflow is as followed:

<ns1:sayHello xmlns:ns1="urn:samples:review">
 <name><item>file.doc</item>
<item>file1.gif</item>
<item>file2.doc</item>
<item>file3.jpg</item>
<item>file4.doc</item>
<item>file5.doc</item>
<item>file6.gif</item>
<item>file7.doc</item>
<item>file8.doc</item></name>
</ns1:sayHello>

and here is the result I get, which does not include the third element (-->file2.doc) :(

<?xml version="1.0" encoding="UTF-8"?>
<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
 <env:Header />
 <env:Body>
 <ns1:sayHelloResponse xmlns:ns1="urn:samples:review">
 <greeting />
 </ns1:sayHelloResponse>
 </env:Body>
</env:Envelope>

Thanks for your help!!! Maybe you can provide me with an example how to use XPATH expressions!!!

Cheers Rainer