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Nested Editing Contexts

Originally in my program I was using the defaultEC to create and insert new objects, but then started to notice I had alot of null objects in my DB. Users are creating an object, then doing nothing with it, then it is committed to the DB when the defaultEC is saved at some later point.

Is this what I'm suppose to be doing to create a nested EC?:
EOEditingContext ec = new EOEditingContext(defaultEC);
Am I suppose to do any sort of locking and so forth?  Should I be using ERXEC?
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