Data Model
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Data Model Policies are rules that apply to a data model such as:
- Standards or guidelines when developing models
- i.e. no special characters in data element names
- Or they can be used to ensure that a new client completes all the appropriate metadata before creating or finalising an item
A list of policies can be found here: 
There are a number of default policies but Data Model Policies can also be created and configured by admins through the user interface.