Idea - List of vertices(Key, X, Y, Priority to store).

```
   <?xml version="1.0" encoding="utf-8"?>
   <Vertices>
    <Vertex Key="0" X="149" Y="209" Priority="7" />
    <Vertex Key="1" X="278" Y="128" Priority="7" />
   </Vertex>

```

Is this valid XML? It keeps saying me that root element is missing, when i try to open it... If so, can someone provide a valid c# XDocument code to open this file ?