When I demo'ed this module recently, I got this error

warning: Invalid argument supplied for foreach() in /Applications/MAMP/htdocs/rdf_demo/sites/all/modules/feedapi_rdf/feedapi_rdf.module on line 291.

and not all feeds from the KML feed were aggregated. The data store looked somewhat mangled.

If I remember right we used this KML feed
http://preparedness.interaction.org/foodsecurity/map/12

I couldn't reproduce this error after the demo on a different install.