09.04.2013 Views

SNOMED CT® Release Format 1 (RF1) Guide - ihtsdo

SNOMED CT® Release Format 1 (RF1) Guide - ihtsdo

SNOMED CT® Release Format 1 (RF1) Guide - ihtsdo

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

G. | Severe upper limb laceration | (primitive)<br />

| severity |=| severe |<br />

J. | Fracture (disorder) |<br />

| site |=| bone structure |<br />

| morphology |=| fracture |<br />

L. | Severe laceration of hand |<br />

None<br />

Note<br />

All distinguishing characteristics are inherited from one<br />

or both of the supertypes.<br />

2.2.1.3.2.3.3. The Short Canonical Form<br />

H. | Hand injury |<br />

| site |=| hand structure |<br />

K. Joint injury<br />

| site |=| joint structure |<br />

M. | Scaphoid fracture |<br />

| site |=| scaphoid bone structure |<br />

The short canonical form is an alternative view of the Relationships that is provided as an <strong>RF1</strong> release file.<br />

It consists of the union of the following two views:<br />

• Proximal primitive supertypes (short normal view) (2.2.1.3.2.3.1.4)<br />

• Primitive differential attribute view of concept definitions (2.2.1.3.2.3.2.3).<br />

2.2.1.3.3. Nature of the definition<br />

A concept definition has one of the following two forms:<br />

1. fully defined concepts :<br />

• The definition is complete. It contains relationships that represent the full set of necessary and sufficient<br />

conditions.<br />

2. primitive concepts :<br />

• The definition is incomplete. It contains relationships that represent a set of necessary conditions but<br />

this set of conditions is not sufficient to fully define the concept.<br />

Note: A necessary condition is a characteristic that is always true of a concept.<br />

Example: | morphology | = | fracture | is a necessary condition of | fracture of femur |.<br />

Note: If all members of a sufficient set of conditions are true they imply that the concept is also true.<br />

Example: | morphology | = | fracture | and | finding site | = | bone structure of femur | form a sufficient<br />

set of conditions that define the concept | fracture of femur |.<br />

Note: All members of the set of sufficient conditions are also necessary conditions. However, some<br />

necessary conditions may not form part of the sufficient set of conditions.<br />

Example:<br />

Consider the concept | gastric ulcer |<br />

• The | finding site | = | gastric mucosa | is a necessary condition for | gastric ulcer |:<br />

• This is true because all gastric ulcers necessarily involve the | gastric mucosa |<br />

Structure and Content <strong>Guide</strong> | 41<br />

© 2002-2012 International Health Terminology Standards Development Organisation CVR #: 30363434

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!