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A major challenge with the edX platform today is that developers do not have a documented way to add new features to the web or mobile client. Worse still, there is no way to introduce such changes without both modifying the edx-platform code base itselfand then updating the mobile clients. The only exception is for features that can be purely implemented as XBlocks as they can be installed into the platform with minimal code changes. See Extending the edX Platform for the documented ways in which developers can extend the platform today.
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