Support for GDF as a report output format
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                 Key: IVY-896
                 URL: https://issues.apache.org/jira/browse/IVY-896
             Project: Ivy
          Issue Type: New Feature
          Components: Core
    Affects Versions: 2.0.0-beta-1
            Reporter: Nascif Abousalh-Neto
            Priority: Minor
             Fix For: unspecified


We have been dealing with some very large graphs here (thousands of nodes, tens 
of thousands of edges) and the information density is so high that the graph 
visualization tools supported by Ivy, GraphViz and yED, were not up to the task.

Then we found out about GUESS 
(http://jung.sourceforge.net/applet/balloonlayout.html), which takes a novel 
approach which combines visualization support (using JUNG, an excellent library 
in itself) with a DSL for graph manipulation based on Jython. This way a user 
can issue commands and run scripts that manipulate the graph contents with 
immediate visual feedback. We have been using it and has proven to be a great 
match for our use cases.

GUESS claims to suport graphml but it was not able to parse the graphml report 
generated by Ivy. So I coded an XSL that creates GDF from the Ivy resolution 
report XML. Besides working :-) this method keeps the relevant (but non-visual) 
attributes from the original report in the GDF as well. These can be later used 
in GUESS to group nodes, create convex hulls, calculate metrics, and so on.



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