Using page parameter in XPath constraint

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I implemented a page containing a list view and also taking a  parameter(string or object).  I would like to use the  parameter in the XPath constraint which serves as the data source of the list view. Is it possible?  Thanks for any help.
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1 answers
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One workaround, though not an optimal one is to create one non-persistent additional attribute in your entity and update the same for passing the value and in that case you can use that attribute in your XPath constraint

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