How to update multiple elements in xml?

Question

Hi!
I've a input xml containing Sales Order information.
The xml-file has a Header and multiple detail records
e.g.
<NS3:header>
+ <NS3:detail>
+ <NS3:detail>
+ <NS3:detail>
+ <NS3:detail>
+ <NS3:detail>
+ <NS3:detail>
+ <NS3:detail>
</NS3:header>
In each detail node, I want to control if requestedDate is a working day and change date if it's not correct
e.g.
<NS3:detail>
-<NS3:product>
-<NS3:item>
<NS3:itemProduct>222288
</NS3:itemProduct>
</NS3:item>
</NS3:product>
<NS3:quantityOrdered>2
</NS3:quantityOrdered>
-<NS3:processing>
<NS3:actionType>A
</NS3:actionType>
</NS3:processing>
<NS3:dateRequested>2012-03-03T13:17:48.439+01:00
</NS3:dateRequested>
</NS3:detail>
In this example is <NS3:dateRequested>2012-03-03T13:17:48.439+01:00</NS3:dateRequested> a Saturday and this element should be updated with the new date for Monday <NS3:dateRequested>2012-03-05T13:17:48.439+01:00</NS3:dateRequested>
The new date is fetched from a Web Service I invoke for each detail record.
I can read each node and get the element for each dateRequested in a while loop by using XPATH as following:
<scope name="Scope_1">
<sequence name="Sequence_2">
<assign name="Assign_3">
<copy>
<from expression="ora:countNodes('inputVariable','payload','/ns1:processSalesOrderElement/ns1:header/ns1:detail')"/>
<to variable="Count"/>
</copy>
<copy>
<from expression="1"/>
<to variable="varindex"/>
</copy>
</assign>
<while name="While_1"
condition="bpws:getVariableData('varindex')&lt;bpws:getVariableData('Count')">
<sequence name="Sequence_1">
<assign name="Assign_6">
<copy>
<from expression="ora:getElement('inputVariable','payload','/ns1:processSalesOrderElement/ns1:header/ns1:detail',bpws:getVariableData('varindex'))"/>
<to variable="outputVariable" part="payload"
query="/ns1:processSalesOrderElement/ns1:header/ns1:detail"/>
</copy>
</assign>
<assign name="Assign_4">
<copy>
<from expression="ora:getElement('inputVariable','payload','/ns1:processSalesOrderElement/ns1:header/ns1:detail/ns1:dateRequested',bpws:getVariableData('varindex'))"/>
<to variable="outputVariable" part="payload"
query="/ns1:processSalesOrderElement/ns1:header/ns1:detail/ns1:dateRequested"/>
</copy>
</assign>
<assign name="Assign_1">
<copy>
<from expression="bpws:getVariableData('varindex') + 1"/>
<to variable="varindex"/>
</copy>
<copy>
<from variable="inputVariable" part="payload"
query="/ns1:processSalesOrderElement/ns1:header/ns1:businessUnit"/>
<to variable="Invoke_1_startSecureCustomerRequestDate_InputVariable"
part="parameters"
query="/ns5:startSecureCustomerRequestDateElement/ns5:businessUnit"/>
</copy>
<copy>
<from variable="outputVariable" part="payload"
query="/ns1:processSalesOrderElement/ns1:header/ns1:detail/ns1:dateRequested"/>
<to variable="Invoke_1_startSecureCustomerRequestDate_InputVariable"
part="parameters"
query="/ns5:startSecureCustomerRequestDateElement/ns5:jdDateRequestedJulian_DRQJ"/>
</copy>
</assign>
<invoke name="Invoke_1"
partnerLink="BT_SecureCustomerRequestDateManager"
portType="ns4:Oracle_E1_SBF_SEI_PkgBldFile_BT_SecureCustomerRequestDateManager"
operation="startSecureCustomerRequestDate"
inputVariable="Invoke_1_startSecureCustomerRequestDate_InputVariable"
outputVariable="Invoke_1_startSecureCustomerRequestDate_OutputVariable"/>
<scope name="Scope_2">
<sequence name="Sequence_3">
<assign name="Assign_5">
<copy>
<from variable="Invoke_1_startSecureCustomerRequestDate_OutputVariable"
part="result"
query="/ns5:startSecureCustomerRequestDateResponseElement/ns5:jdDateRequestedJulian_DRQJ"/>
<to variable="outputVariable" part="payload"
query="/ns1:processSalesOrderElement/ns1:header/ns1:dateRequested"/>
</copy>
</assign>
</sequence>
</scope>
</sequence>
</while>
My problem is how to update the date for each detail record back to my InputVariable.
There is no XPATH function like updateElement or changeElement?!?
I will use the information from InputVariable with the manipulated dateRequested later on to Invoke WS to create Sales Order in a target system.
Thanks,
Niklas

Answer 1

Hi Niklas,
have you considered also moving from assign activities to transformations?
e.g. (in a loop)
1. using an XSLT to prepare data for the 'BT_SecureCustomerRequestDateManager'
-- input document ... from 'inputVariable'
-- input parameter ... from 'varindex'
-- output ................ to 'Invoke_1_startSecureCustomerRequestDate_InputVariable'
2. invoking 'BT_SecureCustomerRequestDateManager'
3. using an XSLT to modify 'inputVariable'
-- input document ... from 'inputVariable'
-- input parameter ... from 'varindex'
-- input parameter ... output from 'BT_SecureCustomerRequestDateManager'
-- output ................ to 'inputVariable'
Then you will not need to create custom Java program (code). It is easy to do the logic/modification inside of an XSLT.
Also BPEL process code will be easier to read.
Regards,
Martin.