I am trying to communicate Citect 2016 with Sepam relay in IEC61850 protocol. I am having questions about editing the xml file. Has anyone done this before? Could you help me with the information in this file and the necessary settings for Citect?
To which XML file are you referring? If this is the Substation Configuration Language (SCL) file for the Sepam device (CID, IID or ICD) you should probably not be editing that. You would typically import that SCL file into the IEC 61850 client for Citect in order to configure it to talk to the Sepam device.
The xml file should either define the explicit path to the CID file, or at least define the name if both the XML and CID are saved in the same directory. Here is an example from the help where the CID file and XML reside in the project directory.
<?xml version="1.0" encoding="utf-8"?>