To create traditional form based data entry it is necessary to have 'widgets' available which express the combination of reference model and archetype based constraints on the user at the time of data entry. The openEHR data types are fully described in the openEHR specifications (Data types). These pages are for documentation of widgets for these data types from the developers' point of view and that of the Graphical User Interface. It is worth noting for those new to openEHR that the idea of 'Null Flavor' (or the reason no data exists at a particular data point is expressed as an attribute of the ELEMENT class and not within the data type (which is truly NULL if not populated).
The important widgets proposed include:
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