Check if content in entry has changed Is there a simple way to know if an entry's content changed when it was saved? 

I'm pulling data from an XML feed and create/update entries in a section. I need to know which entries has new data. I guess I could check each field value individually, or make some kind of hash and check that. But is there some built-in way in Yii/Craft that is easier?
I don't think there's currently anything in Craft that's going to help you here.

Ideally we'd track for dirty/changed fields in JavaScript on an edit entry page and pass that as a parameter into the onBeforeSaveEntry event.