Update xml_schema.md
Merge pull request #3 from andyparsons/patch-1

Update xml_schema.md
Merge pull request #5 from edx-solutions/mjames/feedback_data

Feedback data is saved and retrieved - Pulling to enable QA eyes on this feature. For this to work one must configure a workgroup with id=3 which will include your user. NB - the workgroup members on the right will not be correct yet until MCKIN-1306 is addressed
Quick patch for default when no milestones dates have been reached