supports hierarhical graph definitions? Some dynamics (edge additions and deletions)
Specification:
http://ftp.cwi.nl/CWIreports/INS/INS-R0009.pdf
Author
Short Example
<?xml version="1.0"?>
<!DOCTYPE GraphXML SYSTEM "file:GraphXML.dtd">
<GraphXML>
<graph id="levelOne-1">
<node name="first"/>
<node name="second"/>
<edge source="first" target="second"/>
</graph>
<graph id="levelOne-2">
<node name="third"/>
<node name="fourth"/>
<edge source="third " target="fourth"/>
</graph>
<graph id="levelTwo">
<node isMetanode="true" name="cluster1" xlink:href="#levelOne-1"/>
<node isMetanode="true" name="cluster2" xlink:href="#levelOne-2"/>
<edge source="cluster1" target="cluster2"/>
</graph>
</GraphXML>