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Two consecutive 'less than' signs (i.e. "<<") indicates that the expression constraint is satisfied by all descendants of the specified concept plus the specified concept itself. The expression constraint below evaluates to the set of descendants of
| Scg expression |
|---|
73211009 |Diabetes mellitus| |
, plus the concept
| Scg expression |
|---|
73211009 |Diabetes mellitus| |
itself.
| Scg expression |
|---|
|
<< 73211009 |Diabetes mellitus| |
Using the long syntax, the above expression constraint may be represented as:
| Scg expression |
|---|
|
descendantOrSelfOf 73211009 |Diabetes mellitus| |
The descendantOrSelfOf function is primarily used for attribute values, which refer to a specific clinical value (e.g.
| Scg expression |
|---|
73211009 |Diabetes mellitus| |
,| Scg expression |
|---|
73761001 |Colonoscopy| |
,
| Scg expression |
|---|
385055001 |Tablet dose form| |
), but any specialization of this value is also acceptable.
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