Placeholder
From DOC
A placeholder represents an instance of some entity such as patient or a specific observation.
Described from a UI perspective
A placeholder represents the Entities used in the visible application: Patient, result, problem, assessment, etc. It also indicates the GUI representation of that item both as a full page during a drilldown and when summarized such as on the patient tab (name, age, gender) for example.
A placeholder is characterized visually by having a close button. In addition the actual contents of the placeholder display is visualized by an pane called a drilldown.
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