diff --git a/specs/directed/subgraph.xml b/specs/directed/subgraph.xml
index 5be6476..430d917 100644
--- a/specs/directed/subgraph.xml
+++ b/specs/directed/subgraph.xml
@@ -8,37 +8,37 @@
         <mxPoint x="476.85" y="155.39999999999998" as="offset" />
       </mxGeometry>
     </mxCell>
-    <mxCell id="node1" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;web1&lt;/font&gt;" style="verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
+    <mxCell id="node1" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;web1&lt;/font&gt;" style="ellipse;verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
       <mxGeometry as="geometry" relative="1">
         <mxPoint x="504.0" y="303.25" as="offset" />
       </mxGeometry>
     </mxCell>
-    <mxCell id="node6" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;memcached&lt;/font&gt;" style="verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
+    <mxCell id="node6" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;memcached&lt;/font&gt;" style="ellipse;verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
       <mxGeometry as="geometry" relative="1">
         <mxPoint x="658.8" y="393.25" as="offset" />
       </mxGeometry>
     </mxCell>
-    <mxCell id="node7" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;userdb&lt;/font&gt;" style="verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
+    <mxCell id="node7" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;userdb&lt;/font&gt;" style="ellipse;verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
       <mxGeometry as="geometry" relative="1">
         <mxPoint x="658.8" y="573.25" as="offset" />
       </mxGeometry>
     </mxCell>
-    <mxCell id="node2" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;web2&lt;/font&gt;" style="verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
+    <mxCell id="node2" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;web2&lt;/font&gt;" style="ellipse;verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
       <mxGeometry as="geometry" relative="1">
         <mxPoint x="504.0" y="663.25" as="offset" />
       </mxGeometry>
     </mxCell>
-    <mxCell id="node3" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;web3&lt;/font&gt;" style="verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
+    <mxCell id="node3" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;web3&lt;/font&gt;" style="ellipse;verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
       <mxGeometry as="geometry" relative="1">
         <mxPoint x="504.0" y="483.25" as="offset" />
       </mxGeometry>
     </mxCell>
-    <mxCell id="node4" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;dns&lt;/font&gt;" style="verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
+    <mxCell id="node4" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;dns&lt;/font&gt;" style="ellipse;verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
       <mxGeometry as="geometry" relative="1">
         <mxPoint x="194.4" y="483.25" as="offset" />
       </mxGeometry>
     </mxCell>
-    <mxCell id="node5" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;lb&lt;/font&gt;" style="verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
+    <mxCell id="node5" value="&lt;font style='font-size: 13.0px;' face='Sans-Serif' color='#2d3436'&gt;lb&lt;/font&gt;" style="ellipse;verticalAlign=bottom;html=1;rounded=0;labelBackgroundColor=none;strokeColor=none;fillColor=none;strokeWidth=1;dashed=0;" parent="1" vertex="1">
       <mxGeometry as="geometry" relative="1">
         <mxPoint x="349.2" y="483.25" as="offset" />
       </mxGeometry>