Current Version - Under Revision
Subtype Relationships are expressed in the same way as all other SNOMED CT Relationships. They are identifiable by their RelationshipType, which refers to a Concept with the Fully Specified Name 116680003 |is a|.
Only the most proximate 116680003 |is a| relationships are represented in the distribution files. These Relationships are shown by the blue lines in . However, a Concept is a subtype of any concept to which it has a direct or indirect 116680003 |is a| Relationship.
Figure 4.2-1: _0e7ff052-9e2f-4878-bbed-2dbd7523cbfb__9Figure 1. Graphical view of the of the Supertypes ofidINLINE53084003|Bacterial pneumonia (disorder)|
The number of links in the chain of 116680003 |is a| Relationships between two Concepts does not alter the logical meaning of the relationship between them. The number of 116680003 |is a| Relationships between two Concepts may change between releases of SNOMED CT as a result of the addition of an intermediate Concept. This does not alter the semantic relationship between them.
Some technical implementation issues are affected by whether a pair of Concepts is linked by a single subtype Relationship or by a sequence of several subtype Relationships. In this guide, the following terms are used where this distinction is technically significant:
Figure 4.2-2: I nverted hierarchical view of the Supertypes ofidINLINE53084003|Bacterial pneumonia (disorder)|