public List <LookupVertex> GetVertices(LookupVertex vertex)
 {
     return(_matrix.Where(l => l.StaticFieldCount == vertex.StaticFieldCount && l.GenericFieldCount == vertex.GenericFieldCount && l.LiteralFieldCount == vertex.LiteralFieldCount && l.PropertyCount == vertex.PropertyCount && l.Type.Namespace == vertex.Type.Namespace).ToList());
 }
 public void Insert(LookupVertex vertex)
 {
     _matrix.Add(vertex);
 }