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Here the input form is tied up with a schema ( which is a table in the back end ) if we create a temporary field we need to create a new column in backend. For example : <value label="length" xpath="@lenghVariable"> .. backend we need to have @lengthVariable field to store this value which is not good to add additional column in backend. I need some alert like of dialog box or temp feild where i can see my result like : alert("value is "+ funcntion() ) or <value label = "temp " value ="fucnnti9on()> ty