A string that forms one third of the unique key for the entity being represented. Being the 'source' part of the globally unique key 'type/source/id', this value should be unique the source (like a file name or sql connection) when whence the entity come. This field is only important if enteties of this type can come from different sources.

public abstract string Source { get; }

Public MustOverride ReadOnly Property Source As String
	Get

public:
virtual property String^ Source {
	String^ get () abstract;
}