What is the ontology plugin?

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What is the ontology plugin?

Ravish Bhagdev
Hi,

I just can't understand what the ontology plug-in is for and why would
anyone use it.  From what I could understand from code, it uses the classes
in the specified owl file and uses them as keywords to refine the query.
Does this involve re-ranking as well?  I tried using an owl file as
specified on wiki but it didnt have any effect on the reults.  I wonder
whats going on.  Can anyone who might have used and found it useful explain
please?

Thanks,
Ravish.