shell> curl -X PATCH --data-binary @- --dump - http://localhost:8529/_api/graph/graph/edge/edge1 <<EOF
{ 
  <span class="hljs-string">"optional3"</span> : <span class="hljs-string">"val3"</span> 
}
EOF

HTTP/<span class="hljs-number">1.1</span> <span class="hljs-number">202</span> Accepted
content-type: application/json; charset=utf-<span class="hljs-number">8</span>
etag: <span class="hljs-number">750580028</span>

{ 
  <span class="hljs-string">"edge"</span> : { 
    <span class="hljs-string">"_id"</span> : <span class="hljs-string">"edges/edge1"</span>, 
    <span class="hljs-string">"_key"</span> : <span class="hljs-string">"edge1"</span>, 
    <span class="hljs-string">"_rev"</span> : <span class="hljs-string">"750580028"</span>, 
    <span class="hljs-string">"_from"</span> : <span class="hljs-string">"vertices/vert1"</span>, 
    <span class="hljs-string">"_to"</span> : <span class="hljs-string">"vertices/vert2"</span>, 
    <span class="hljs-string">"$label"</span> : <span class="hljs-literal">null</span>, 
    <span class="hljs-string">"optional1"</span> : <span class="hljs-string">"val1"</span>, 
    <span class="hljs-string">"optional3"</span> : <span class="hljs-string">"val3"</span> 
  }, 
  <span class="hljs-string">"error"</span> : <span class="hljs-literal">false</span>, 
  <span class="hljs-string">"code"</span> : <span class="hljs-number">202</span> 
}