Focus concepts and refinements
As illustrated by
consists of one or more conceptIds plus optional
may include any number of attributes.
are expressed as name-value pairs and may apply independently or as part of a group.
The name part of the
is a conceptId that refers to a
that names the characteristic that is refined by this attribute. The value part of the
. In simple cases, this is just a conceptId referring to a
that represents the appropriate value for this attribute. However, it may also be a nested
as shown in .
illustrates the potential for nesting of
and the naming conventions applied in this guide to distinguish different parts of an
at different levels. The top level of an
is referred to as the "focus expression". It consists of a set of one or more
. The values of the attributes in the
are a "nested expression" that consist of one or more "value concepts" optionally refined by a nested
may be nested recursively so there may be further levels of "nested expressions" with "nested refinement". If it is necessary to distinguish the level of nesting, the following naming convention is applied.
Annested inside a level ( N - 1)
Illustration of the names used to refer to parts of a nested expression
The general pattern shown in
applies to all
whether or not they include
illustrates the specific features of an
that includes a representation of
During some stages of processing, the "clinical kernel" is separated from the "nested expression". When separated from its context the "clinical kernel" is the "focus expression" of a context-free
Illustration of the names used to refer to parts of an expression that represent context