The
between the records in the
in the
are depicted in the following diagram.
Figure 1. Relationships between files
Each
is held as a single row in the
Concept file.Each row represents a clinical
.
Each
has two or more
associated with it (at least one
and at least one
). Each
is held as a single row in the
Description file, and may only refer to a single
.
Each
, from a source
to a destination
, is held as a single row in the
Relationship file. The type of each
is defined by reference to a linkage
, also held within the
Concept file .
The most basic form of
is the subsumption
, identifying that one
is a kind of another
. For example, an |Outpatient procedure| |Is a| |Procedure|. All the
in
form an |Is a|
, with a parent
connected to each
by an |Is a|
. In this
, a
may have more than one parent
. The root of the
is the |
|, which has 19 top level
, each forming its own
. There are no |Is a|
that cross from one of these sub-hierarchies to another (e.g. from a
in the Procedures
to a
in the Substances
.
In addition to the
|is a|
, other
are also held within the
Relationship file, such as |Finding site| or |Laterality|.
types are specified under the |Linkage|
in the |
Model
|
.
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