Dynamic insertion of elements based on dynamic condition

Question

I need to achieve the following:
Input:
<Customer>
     <name>Name1</name>
     <email>Email1</email>
     <phone>Phone1</phone>
     <Number>Num1</Number>
<Customer>     
Output:
<Customer>
     <name>Name1</name>
     <email>Email1</email>
     <phone>Phone1</phone>
     <Number>Num1</Number>
     <Addresses>
          <Address>add1</Address>
          <Address>add1</Address>
          <Address>add1</Address>
     </Addresses>
<Customer>
Based on the number of Addresses that exist for the customer, multiple <Address> elements should be added.
I can't determine number of Addresses at the beginning. It is deterrmined dynamically based on certain condition.
So each time when the condition is met, I need to get the count of <Address> elements that exist and insert the new one last.
My logic:
     Switch (case)     ==> Add <Address> only if condition is met
          count ==> count(bpws:getVariableData('outputVariable','payload','/ns1:Customer/ns1:Addresses')) ==> 0 first time
          <Addresses>
               <Address>add1</Address> ===> Now I need to insert this.
          </Addresses>
I have the following in my bpel:
<assign name="AssignInsertAfterExisting">
<copy>
<from expression="count(bpws:getVariableData('outputVariable','payload','/ns1:Customer/ns1:Addresses'))"/>
<to variable="NumberOfAds"/>
</copy>
<copy>
<from expression="'123 street'"/>
<to variable="nextAddress"/>
</copy>
<bpelx:insertAfter>
<bpelx:from variable="nextAddress"/>
<bpelx:to variable="outputVariable" part="payload"
query="/ns1:Customer/ns1:Addresses/ns1:Address squareBrakets NumberOfAds squareBrakets"/>
</bpelx:insertAfter>
</assign>
But with the above I am receiving the folllowing error:
     Assign Operation Misuse.
     The to-spec does not yield any data; insertAfter operation cannot be performed.
Please check the BPEL source at line number ..
I can I insert dynamically insert elements into array. I have seen the example provided in samples, but my problem is little different than that.
Edited by: user10367892 on Aug 4, 2009 3:16 AM

Answer 1

append is appending value of variable to existing element, instead of creating a new element in the array:
For Eg:
Input:
<bpelx:append>
<bpelx:from variable="nextAddress"/>
<bpelx:to variable="outputVariable" part="payload" query="/ns1:Customer/ns1:Addresses/ns1:Address"/>
</bpelx:append>
Output if nextAddress = Address2 and if <Address>Address1</Address> already exists
<Customer>
     <Addresses>
          <Address>Address1Address2</Address>
     </Addresses>
</Customer>