>-- DN.Mapping.VertexMapping.XAttribute --> L0.String <R L0.HasProperty
>-- DN.Mapping.VertexMapping.YAttribute --> L0.String <R L0.HasProperty
// Production
>-- DN.Mapping.VertexMapping.dpAttribute --> L0.String <R L0.HasProperty
>-- DN.Mapping.VertexMapping.XAttribute --> L0.String <R L0.HasProperty
>-- DN.Mapping.VertexMapping.YAttribute --> L0.String <R L0.HasProperty
// Production
>-- DN.Mapping.VertexMapping.dpAttribute --> L0.String <R L0.HasProperty