Common Interface needed for all node types, to facilitate logging

[tomwjaw]

I ran into a problem, where I am trying to create logging for checking validity of XML data.
It would be very convenient if all node types and attribute had a common interface or base class, which holds the name, file line number, type identifier and possibly reference to the value, so that a logging function can be made independent of the type being sent for logging. I can implement the change and post back for review.

[leethomason]

XMLNode is the common base class.

[tomwjaw]

Except XMLNode is not a base class for the XMLAttribute

[ajtruckle]

Maybe that is because it is not a type of node. It is an attribute which is entirely different. Sent from Outlook for iOS<https://aka.ms/o0ukef>

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