How can we link XML file to PhAB to show the XML file tree structure?
explain further please.
Linking is actually the process a app gets told where to find the function referenced in the source. So linking is generally done with libraries 
Do you want to import the XML file or present its contents in a window in your app?
Photon has no support for XML. You have to write your own code.
Yes i actually meant :
I want to import the XML file or present its contents in a window in my app?
How is it possible…
can i access data files like XML using photon?
Photon has no support for XML. You have to write your own code. Neutrino 6 comes with expat library which can help you read XML files. Then you have to create photon code ( based on PtTree maybe ) to display the data.