These are reproduced from Appendix A of the Expression Constraint Language - Specification and Guide which provides detailed background and further information on ECL. Links embedded in the text below may take you to that document or to other external references.
Simple Expression Constraints
Expression Constraint
Valid Expression1
Precoordinated
Postcoordinated
-
-
*
Footnotes Ref Notes 1 Where necessary, these examples make some assumptions about the membership of the example reference sets. 2 Please note that this makes the assumption that the given expression constraint is executed against a finite set of expressions that has been pre-classified (e.g. in an expression repository), and that after classification there are no intermediate expressions between this expression and 404684003 |Clinical finding|. 3 Please note that this makes the assumption that the given expression constraint is executed against a finite set of expressions that has been pre-classified (e.g. in an expression repository), and that after classification there are no intermediate expressions between 40541001 |Acute pulmonary edema| and this expression.
Refinements
Footnotes Ref Notes 1 Please note that some of these examples are based on a hypothetical drug concept model. These examples are not intended to reflect any specific drug model. 2 SNOMED CT identifiers with the '9999999' namespace were created for example only, and should not be used in a production environment.
Cardinality
Expression Constraint
Valid Expression1
Precoordinated
Postcoordinated
-
64572001 | Disease| :
{ 116676008 | Associated morphology| =
396351009 | Congenital septal defect| ,
363698007 | Finding site| =
25943004 | Structure of atrioventricular node| ,
363698007 | Finding site| =
113262008 | Thoracic aorta structure| }
{ 116676008 | Associated morphology| =
90141005 | Congenital hypertrophy| ,
363698007 | Finding site| =
244384009 | Entire right ventricle| }
< 373873005 |Pharmaceutical / biologic product| : [1..3] { [1..*] 127489000 |Has active ingredient| = < 105590001 |Substance| }
< 404684003 |Clinical finding| :
[0..0] { [2..*] 363698007 |Finding site| = < 91723000 |Anatomical structure| }
Footnotes Ref Notes 1 The SNOMED CT identifiers created with the '9999999' namespace are for example only, and should not be used in a production environment. 2
Conjunction and Disjunction
Expression Constraint
Valid Expression1
Precoordinated
Postcoordinated
< 404684003 |Clinical finding| :
{ 363698007 |Finding site| = << 39057004 |Pulmonary valve structure| ,
116676008 |Associated morphology| = << 415582006 |Stenosis| } OR
{ 363698007 |Finding site| = << 53085002 |Right ventricular structure| ,
116676008 |Associated morphology| = << 56246009 |Hypertrophy| }-
Footnotes Ref Notes 1 Where necessary, these examples make some assumptions about the membership of the example reference sets.
Exclusion and Not Equals
Expression Constraint
Valid Expression1
Precoordinated
Postcoordinated
< 404684003 | Clinical finding| :
116676008 | Associated morphology| =
((<< 56208002 | Ulcer| AND
<< 50960005 | Hemorrhage| ) MINUS
<< 26036001 | Obstruction| )64572001 | Disease| :
{ 116676008 | Associated morphology| =
26036001 | Obstruction| ,
363698007 | Finding site| =
422897007 | Vascular structure of stomach| }
{ 116676008 | Associated morphology| =
45771005 | Acute bleeding ulcer| ,
363698007 | Finding site| =
422897007 | Vascular structure of stomach| }< 404684003 | Clinical finding| :
[0..0] 116676008 | Associated morphology|
!= << 26036001 | Obstruction| AND
[1..*] 116676008 | Associated morphology|
= << 26036001 | Obstruction|
Footnotes Ref Notes 1 Where necessary, these examples make some assumptions about the membership of the example reference sets.
Nested Expression Constraints
Expression Constraint
Valid Expression1
Precoordinated
Postcoordinated
-
-
<< 125605004 |Fracture of bone| :
[0..0] ((<< 410662002 |Concept model attribute| MINUS 363698007 |Finding site| ) MINUS 116676008 |Associated morphology| ) = *
Footnotes Ref Notes 1 Where necessary, these examples make some assumptions about the membership of the example reference sets.