Graph, GraphML, Gephi and Edge Labels

[Heidi McClure]

Hello,

I am trying to export graph data from a Solr index (version 7.2) in a format 
that can be imported to Gephi for visualization.  I'm getting close!  Is there 
a way to add edge labels to the exports from this type of command (see curl 
command that follows and sample outputs)?

Thanks in advance,
-heidi

Based on the examples found here: 
https://lucene.apache.org/solr/guide/7_2/graph-traversal.html , this is working 
in my GDELT-based data set query request:

curl --data-urlencode 'expr=nodes(gdelt_graph,
                                  nodes(gdelt_graph,
                                        walk="POLICE->Actor1Name_s",
                                        trackTraversal="true",
                                        gather="Actor2Name_s"),
                                  walk="node->Actor1Name_s",
                                  scatter="leaves,branches",
                                  trackTraversal="true",
                                  gather="Actor2Name_s")' 
http://mymachine:8983/solr/gdelt_graph/graph

Output is like this (just a subset):
<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns 
http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd";>
<graph id="G" edgedefault="directed">
<node id="POLICE">
<data key="field">node</data>
<data key="level">0</data>
</node>
<edge id="1"  source="BANGLADESH"  target="POLICE"/>
<node id="HOSPITAL">
<data key="field">Actor2Name_s</data>
<data key="level">1</data>
</node>
<edge id="2"  source="POLICE"  target="HOSPITAL"/>
<node id="UNITED STATES">
<data key="field">Actor2Name_s</data>
<data key="level">1</data>
</node>
<edge id="3"  source="UNITED STATES"  target="UNITED STATES"/>
<edge id="4"  source="AFRICA"  target="UNITED STATES"/>
<edge id="5"  source="POLICE"  target="UNITED STATES"/>

And I'd like to have a key for label and the data tag on the edges so that I 
can get the Labels into Gephi.  Does anyone know if this can be done?  Below is 
example of what I mean.  Notice the key for label at the top of the file and 
the "This is an edge description" entries on two of the edges (ids 1 and 2).

<?xml version="1.0" encoding="UTF-8"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns 
http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd";>
    <key id="label" for="edge" attr.name="label" attr.type="string"/>
    <graph id="G" edgedefault="directed">
        <node id="POLICE">
            <data key="field">node</data>
            <data key="level">0</data>
        </node>
        <edge id="1"  source="BANGLADESH"  target="POLICE" label="foo">
            <data key="label">This is an edge description.</data>
        </edge>
        <node id="HOSPITAL">
            <data key="field">Actor2Name_s</data>
            <data key="level">1</data>
        </node>
        <edge id="2"  source="POLICE"  target="HOSPITAL">
            <data key="label">This is an edge description.</data>
        </edge>
        <node id="UNITED STATES">
            <data key="field">Actor2Name_s</data>
            <data key="level">1</data>
        </node>
        <edge id="3"  source="UNITED STATES"  target="UNITED STATES"/>
        <edge id="4"  source="AFRICA"  target="UNITED STATES"/>
        <edge id="5"  source="POLICE"  target="UNITED STATES"/>