Hi Sudha,
I am not with Jama so I don't know the answer to your question directly. Here are some comments, though.
From Wiki: "
PlantUML is an open-source tool allowing users to create
UML diagrams from a plain text language. The language of PlantUML is an example of a
Application Specific Language.
[3] It uses
Graphviz software to layout its diagrams."
I assume your question has to do with being able to create a relationship diagram using Graphviz. It seems the current version of Jama does not support a direct export to PlantUML/Graphviz. At my company, someone happened to wrote an Excel VBA macro that takes the Jama export of a single record and finds all the downstream items and use Graphviz to generate a diagram in .PDF format. So I know theoretically a "plugin" is possible via Excel/VBA macro.
As you might know already, there are other ways to expose relationships within the Web UI, such as Coverage Explorer, Impact Analysis, and configure Explorer to shows relationships in tree.
Good luck.
swoo