How to set variable value in an XML array

Hi,
Please let me know how to set the value for a xml array element using assign activity inside a for-each block in BPEL 11g
I tried to set the variable value for result element using the below condition but i encountered selection failure message
$outputVariable.payload/ns1:Student['i']/ns1:result or
$outputVariable.payload/ns1:Student[$i]/ns1:result
And the xsd used is as below
<xsd:complexType name="StudentCollection">
<xsd:sequence>
<xsd:element name="Student" type="Student" minOccurs="0" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:complexType>
<xsd:complexType name="Student">
<xsd:sequence>
<xsd:element name="Name" type="xsd:string"/>
<xsd:element name="location" type="xsd:string"/>
<xsd:element name="mark" type="xsd:string"/>
<xsd:element name="result" type="xsd:string"/>
</xsd:sequence>
</xsd:complexType>
Thanks,
Dhana

Hi,
At the back of button specify the following parameter:-
CMD    1        Execute_planning_function
Planning_function_name 1   xyz
Var_name     1    variable_name
var_value      1    blank
Can also refer to link below:-
http://www.sdn.sap.com/irj/scn/go/portal/prtroot/docs/library/uuid/b0a89464-f697-2910-2ba6-9877e3088954?quicklink=index&overridelayout=true(can refer to page 20)
http://www.sdn.sap.com/ddc5564a-337d-4cf9-a34e-2dab64df09be/finaldownload/downloadid-a61a6724ba8e7b7fbd9c5df9590ab50d/ddc5564a-337d-4cf9-a34e-2dab64df09be/irj/scn/go/portal/prtroot/docs/library/uuid/f0881371-78a1-2910-f0b8-af3e184929be?quicklink=index&overridelayout=true
Hope it may help

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Hi All,
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http://www.sdn.sap.com/ddc5564a-337d-4cf9-a34e-2dab64df09be/finaldownload/downloadid-a61a6724ba8e7b7fbd9c5df9590ab50d/ddc5564a-337d-4cf9-a34e-2dab64df09be/irj/scn/go/portal/prtroot/docs/library/uuid/f0881371-78a1-2910-f0b8-af3e184929be?quicklink=index&overridelayout=true
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I'm afraid I haven't made my question understood clearly.
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