<uevol:constant name="AP_status_request_period" value="1" description="Message "Train AP status Request" period" />
c this is partial xml file.. the tag name and element name it contains prefixes, when i load this file using xml Document and use Xpath query to get "uevol:constant name="AP_status_request_period"" or any other Attribute or Tag it self it is giving XpathException "Namespace Manager or XsltContext needed. This query has a prefix, variable, or user-defined function."
here how i have to provide Namespace manager to solve this problem.