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- The first part, #Archetype nodes, values and terms addresses the concepts of terminology binding vs. term binding (labelled constraint_binding and vs term_binding in ADL).
- The second part looks at the 3 primary hierarchies in SNOMED most relevant to observations, namely Observable Entity, Procedure and Clinical Finding.
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Terminology binding is a concept used widely in e-health. Notwithstanding its use as in term binding below, terminology binding usually refers to the association between a data point (node) of an information or data model and the set of terms that can be used to populate that data point's value. Thus, _ terminology binding is a constraint imposed through a specification, reflecting some business rule. Such a business rule could be internationally agreed, or could be a much more localised constraint, imposed by a local institution or software vendor. In openEHR Archetypes, terminology binding can be specified using the constraint-binding section, particularly with placeholder constraints as described in section 5.3.9 (p62) of the ADL 1.4 specification.
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