ected or undirected. The options are <tt>directedS</tt> and <tt>undirectedS</tt>.</td>
  <td><tt>directedS</tt></td>
</tr>
<tr>
  <td><tt>VertexProperty</tt></td>
  <td>for specifying internal property storage.</td>
  <td><tt>no_property</tt></td>
</tr>
<tr>
  <td><tt>EdgeProperty</tt></td>
  <td>for specifying internal property storage.</td>
  <td><tt>no_property</tt></td>
</tr>
<tr>
  <td><tt>GraphProperty</tt></td>
  <td>for specifying property storage for the graph object.</td>
  <td><tt>no_property</tt