Agents and Topic Maps

I´m quite new with Topic Maps and have following questions:

What could a software agent do with Topic Maps?
Concrete, what data would a mobile agent collect, if it saw Topic Maps?

Most important question:
Are there existing examples for agent or multiagent systems using Topic
Maps?
How does it work exactly? (agent communication)

I would appreciate any example in detail or links referring to.

Best Regards
René Schmitt


FYI:
I´m writing a seminar paper about knowledge representation.
Theme is agents and distributed applications.