I'm looking at the demo code for drag and drop and trying to understand 
it all.

the document at: http://qooxdoo.org/documentation/0.8/ui_overview?s=drag 
drop#drag_drop

tells me to have a dragstart on the source and drop on the target, but 
the demo code has
droprequest on the source, too

I looked in the docs but couldn't find a list of events to read about


first of all,
in the dragstart listener, what does e.addType do?  I know the comment 
says register supported types, but types of what?

then in droprequests
 they do a e.getCurrentType(), there where type types set, (values, 
items) what is meant by current?



I'm thinking these things are related to the list which is the drag 
source in the demo.


My drag source in a Image and I'd like to know which image was dropped, 
do I rely on the object name + hash to do this or can I set some kind of 
label or attribute to identify the image that was dropped?



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