protected abstract string ExportRelationship(Relationship relationship);
internal Relationship AddRelationship(Element source, Element target, string description) { var relationship = new Relationship { Source = source, Target = target, Label = description }; _relationships.Add(relationship); return relationship; }
protected override string ExportRelationship(Relationship relationship) { return string.Empty; }
public void Add(Relationship relationship) { _relationships.Add(relationship); }