Error in giving variable in ora:readFile() Xpath function

Hi,
I have a requirement like i need to give a variable name in ora:readFile() Xpath function. Below is the method in which i am trying. but i am getting error
ora:readFile('file:////home/casdevro/tbm/archive/bpws:getVariableData('inputFile')')
Error iam getting while compiling is:
Error(80):
[Error ORABPEL-10039]: invalid xpath expression
[Description]: in line 80 of "C:\Softwares\JDev10.1.3.4\jdevstudio10134\jdev\mywork\Test\bpel\Test.bpel", xpath expression "ora:readFile('file:////home/casdevro/tbm/archive/bpws:getVariableData('inputFile')')" specified in <from> is not valid, because XPath query syntax error.
Syntax error while parsing xpath expression "ora:readFile('file:////home/casdevro/tbm/archive/bpws:getVariableData('inputFile')')", at position "71" the exception is Expected: ).
Please verify the xpath query "ora:readFile('file:////home/casdevro/tbm/archive/bpws:getVariableData('inputFile')')" which is defined in BPEL process.
[Potential fix]: Please make sure the expression is valid.
Am i missing anything. Please guide me
Thanks in advance.

Try this. And I guess one forward slash after "file:" suffices.
ora:readFile(concat('file:/home/casdevro/tbm/archive/', bpws:getVariableData('inputFile')'))

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