Fill an array which is initially empty

Hi,
My array is defined by the variable:
<variable name="array" element="imp1:array">
where the array is:
<element name="array" type="tns:ArrayType"/>
<complexType name="ArrayType">
<sequence>
<element name="offer" type="tns:LoanOfferType" maxOccurs="unbounded" />
</sequence>
</complexType>
I want to fill this variable with one value at a time through a while activity and without using a Java exec.
I read the DataManipulation Tutorial and the Array sample but they don't help me!
Which ora:function should I use? and in which assign construct?
Because the following snippet returns a bpws:selectionFailure fault:
<assign
<copy>
<from variable="inServiceOffer" part="payload" query="/auto:loanOffer"/>
<to variable="array" query="/imp1:offert[bpws:getVariableData('index')]"/>
</copy>
</assign>
Where 'index' is an integer variable.
The problem is that the child node doesn't exist, so the above query returns a bpws:selectionFailure fault.
Maybe I can use the ora:addChildNode or ora:appendToList function, but I don't know where...
Thank you for your reply

What I want to say is that with the ora:addChildNode function I can add a DOM child element without any relationship with the child type defined in a XML Schema array. In short, my array could be the follow:
<element name="array" type="tns:arrayType"/>
<compexType name="arrayType">
<element name="para" type="anyURI:NCName" maxOccurs="unbounded"/>
</complexType>
and the following snippet works all the same!!!
<assign name="FillArray">
<copy>
<from expression="ora:addChildNode(bpws:getVariableData('array','/imp1:array'),bpws:getVariableData('inServiceOffer','payload','/auto:loanOffer'))">
</from>
<to variable="array" query="/imp1:array"/>
</copy>
</assign>
In fact, in the above example, the source child type is "auto:loanOfferType" while the target child type can be "anyURI:anyType".
So I think the ora:addChildNode function doesn't fill an array but adds children of any type to an element.
Can you help me?
Thanks and sorry for my english.

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classboy wrote:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5
at rekener.getGetal(rekener.java:22)
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