Given an XML file with multiple objects corresponding to the same
location, how can I aggregate their description data into the
description field of a single marker?

My intuition is to do this during XML parsing -- check if an overlay
exists for the parsed latitude and longitude, and if so, add to its
description data rather than create a new marker.  The trouble is, I
can't tell if the API has a method like map.getOverlay(lat,long).

Does it?  Any other approaches?

Thanks!

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