Open-EHR [10] provides specifications for shared
EMR, which is more “technology-based” than
“standards-based” [8]. It consists of a two-level model,
one level of which is a simple reference model (RM)
and the other a formal constraints model called an
archetype. The RM describes the basic structure of
clinical information whereas the archetype models
provide architectural standards for EMR information
and share common clinical definitions specified in the
shared Open-EHR archetype repository. Each
archetype can be considered a model containing
clinical content and can be expressed in a constraint
formalism form. The information model is proposed as
a separate model from the demographic information
model and finally the Extract package is archetyped
containing both of them. The most important package
of this RM model is ‘ENTRY’ which is based on the
Clinical Investigator Recording (CIR) ontology [12]. It
is claimed to fill the greatest portion of the POMR
[12].