A CDA template defines additional syntax rules that constrain the overall CDA syntax and semantics, to more tightly define the rules of the road for a specific kind of CDA document (or portion of a CDA document).

A CDA template can be a document template – that defines overall rules for an entire CDA document – or a more specific header templatesection template, or entry template covering a relevant portion of the overall CDA document (e.g. a section template defines a CDA section).

Templates form a hierarchy. Document templates indicate which header templates and section templates should be used, section templates can reference additional nested section templates and entry templates, and entry templates can contain other entry templates.

Templates can be mixed and matched and re-used. For example, the same entry template can be used inside other entry templates or section templates.

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