Base class for the relationship classes for db drivers. It represents a non-directed edge between two DBTable instances . The RelationshipType defines how the startVertex is related to the endVertex. It also implies how the endVertex is related to the startVertex, as the relationship has no direction: it's a relationship between the startVertex and the endVertex. StartVertex is the FK side, EndVertex is the PK side. In m:n relations, it doesn't matter, both vertices are the vertices which are related to each other over an m:n relationship. RelationshipType is about startVertex relationshipType endVertex, hence no 1:n type, as the startvertex is either always the FK side or one side of an m:n relationship.

public class DBRelationshipEdge : NonDirectedEdge<DBTable>, 
	ISerializableToXml

Public Class DBRelationshipEdge
	Inherits NonDirectedEdge(Of DBTable)
	Implements ISerializableToXml