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Usage

${ ui.includeFragment("widgets/field", [ class: org.openmrs.Role.class, formFieldName: "role"]) }
    // will delegate to (i.e. include) the "fields/org.openmrs.Role" fragment

How to write a field

• Create a fragment under the "fields" folder as "the.package.ClassName". (TODO where would you put the controller?).
• Do not implement a label (so that one may be added by the labeledField widget)
• Do include a span to display errors with id "${ id }-error"

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